So now I have a bunch of blisters and rain spots, and plenty of roller marks to address. I just completed a moisture test (using a calcium-chloride test). If left on the surface, the spilled material will migrate through the sealer. If you go this route, make sure to use a product that is not water-soluble. Also, will concrete set in the rain? Here is my question: Because of the high moisture readings, should I do this job? Let the deck dry for 24 to 48 hours after staining it, advises House Painting Info. In a pinch, back rolling after spraying with a pump-up sprayer might have helped vs. using a gloved hand. By curing, I mean for the sealer to penetrate the surface and not be diluted by any water/rain. If an airless sprayer is not available, I would recommend applying the sealer with a micro-fiber mop, using a push-and-pull motion to get thin, even, streak-free coverage. Add water until the powder is thoroughly wet. An hour after I finished applying the sealer, it rained. Whether the humidity is manmade or natural, it can cause short-term high moisture readings, especially in the spring and fall, when days are warm and nights are cool. It can then take up to 4 days to cure and harden to its maximum strength. This is especially true for nonbreathable coatings, like the polyurethane you plan to use. Yes, concrete doesn't ' dry' when it sets, it completes a chemical reaction. Driveway sealer will dry like paint from the top down. Home / World View / How Long Does It Take for a Concrete Driveway to Dry? Contact us and view our privacy policy, terms & conditions, and press room. If the finishing process was recently completed, rainwater may not cause damage as long as it is not worked into the surface and the slab is left untouched. Be sure to start watering the concrete in the morning and keep watering throughout the hottest part of the day. When the moisture readings drop low enough for you to seal the concrete (at or below 4 pounds), apply the sealer in the afternoon or evening, when humidity is lowest. Simply conduct a search using the terms "concrete moisture vapor transmission" or "concrete moisture testing.". As I was talking about the issue, another Home Depot customer overheard me and said he had success applying sealer to decorative concrete using a basic plunger sprayer, similar to what you would use to apply garden chemicals. I am not a fan of stain and sealer on surfaces that are often wet or come in continuous contact with water. If they are wet, do not paint the surface. The good news is that the fix is actually pretty straightforward. How Long Does Concrete Take to Dry Before Rain? Even if it starts raining after a concrete pour, the potential for damage may not be that serious. However, once the concrete has been finished (between 4-8 hours after pouring), and has set enough for walking on, the effects of rain should be minimal. When should I start watering my concrete? Steps for this vary depending on the type of sealer. The trick when pouring underwater is to ensure the concrete is fed to the final position without 'falling' through the water. How To Ly A Driveway Sealer Sealing You. Plan the deck staining project when rain is not expected in the forecast. Second, the concrete surface must be dry at the time of sealer application. See more detail below. Before application the floor was scrubbed with warm water and TSP, allowed to dry, and then sealed with a coat of CPES (Clear Penetrating Epoxy Sealer). Be sure to apply the sealer when it will remain rain-free for 24 hours after sealing. I sealed it less than 12 hours after washing, and I know now that was not a good idea. Bring the floor up to temperature slowly before sealing. How long should fresh concrete be kept wet? Explanation: Yes rain can wash the sealer off if it rains right after its put on. Unless you use a sealer designed specifically for constant water contact, you will have performance issues like haze and whitening and eventual failure. This can weaken the surface of the concrete, making it a softer consistency and decreasing the strength of the concrete. How long does it take for concrete sealers to dry once they are applied? Take note that it is difficult to find a retailer for fast dry sealers. What happens if you apply a sealer, coating, or adhesive to a slab with an MVT rate exceeding 4 pounds per 1,000 square feet or 75% relative humidity? Economical yet functional, wet concrete look. You can walk on the driveway as soon as it feels dry to the touch, usually just a few hours in sunny areas. What is the standard allowable moisture vapor transmission (MVT) rate when applying sealers? That being said, you have a slab that should eventually drop below 4 pounds because of the vapor barrier. It should not be exposed to rain for 24 hours or at least until it has dried. Acrylic Concrete Sealers: Acrylic sealers are used to enhance and protect interior and exterior concrete with a wet look, low gloss, or high gloss finish. Although colorants and other factors can affect concrete’s curing time, most concrete installations can handle light rain two hours after pouring. This is the first time I have done a test like this. In general, I am not a fan of spraying water-based sealers. Keeping this in consideration, will concrete set in the rain? Only one or two roll passes are necessary. Let's take a closer look at the difference between curing and drying. well as for general knowledge concrete will set after a few hours and can considered dry a day after the pouring time.. so if you asking how long would it reaches the suitable hardness where rain is not damaging the concrete.. then you refer to the material … According to the ASTM standard for conducting a calcium-chloride test (ASTM F 1869), a reading above 4 pounds-the amount of moisture flow in pounds per 1,000 square feet over a 24-hour period-is considered a no-go for sealing. In certain random areas, the sealer foamed and bubbled. Chances are good that the application will fail, turn white, or peel. I used a ¾-inch-nap roller to apply the sealer, per my concrete installer's recommendation. A. Do not seal freshly placed concrete until it has bleed and the setting process has begun. Evaporation then begins and the water, in gas form, eventually evaporates back out of the concrete through the sealer. If the air above your floor has a high concentration of water vapor, or humidity, then the concrete will absorb moisture until it contains water equal to what is in the air. Can you drive on a bad oil pressure sensor? Before using one of these products, make sure it's designed to be used in conjunction with a stain or tint. The process of osmosis now comes into play-the movement of a liquid or gas from an area of high concentration to low concentration until balance is achieved. How long does the concrete sealer have to dry before it's exposed to rain? How long will DRYLOK® Masonry Waterproofer maintain its effectiveness? This is actually a good thing as long as the wet spot disappears completely. Sealers usually dry in one to two hours, depending on the temperature and humidity. This should also get rid of the water marks from the rain. Do I have to pay a mortgage discharge fee? I just ordered a sprayer, which was also recommended by the sealer manufacturer. Can you explain what caused the bubbles and recommend the best type of sprayer to use on future projects? This is true of both penetrating and topical sealers. Specific sealer types (water-based, solvent-based, polyurethane, epoxy, etc.) How Long Does Driveway Sealer Take To Dry Mycoffeepot Org . My new (35 days old) concrete deck is stamped, and my wife and I acid stained it this weekend. Rub your fingertips over the suspect area. Pouring Concrete vs Pouring Rain. When sealing exterior concrete surfaces, remember that humidity and condensation are most often higher in the morning. The second coat of sealer will melt the first coat, then the back rolling while the sealer is wet will help lay it down and get rid of the bubbles and blisters. Acrylics provide a great cost-to-performance ratio, which is why we see them used so often. If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. Additionally, should I cover newly poured concrete if it rains? This is a large 8,000-square-foot floor in the cafeteria of a local manufacturer, and it receives heavy traffic. This moisture will stay in the concrete until the moisture content of the air above the slab abates. Apply to dry or slightly damp surfaces. I washed it with high pressure and light brooming, per the stain manufacturer's recommendations, and rolled on a solvent-based acrylic sealer. Keeping quick-set concrete completely dry right up to the point of use is crucial to the successful mixing of the concrete, so it is not advisable to use it in the rain. You may need to remove the old cement sealer before applying the new one. Copyright 1999-2021 ConcreteNetwork.com - None of this site may be reproduced without written permission. Cement starts off as a powder-like substance that is mixed with … The practice of closing doors and windows to "dry-in" a room or building can actually trap moisture and create a steam room of sorts, making the problem worse or creating a problem where one didn't exist. How Long Does Driveway Sealer Need To Dry Before Rain. When I hear basement, I think damp, little air movement, slow drying and trapped moisture. I plan to spray another thin layer of sealer when done, so it's OK if it strips some of the existing sealer. This is counterproductive when it comes to acrylics and diminishes performance. A simple math calculation provides an extrapolation of the MVT rate in a 1,000 square foot area over 24 hours. Your best bet is to spray apply the next coat of sealer at the same rate, and then have someone else back roll right next to you. Therefore, the time it takes for a sealer to fully dry will depend on the type of sealer you use. Most concrete sealers dry fairly quickly and usually dry to touch within 1-3 hours. QUIKRETE® Concrete Mix is another excellent mix for constructing QUIK-TUBE™ footers. Sealers that can handle constant water contact are usually high-end epoxies, polyurethanes and polyureas. Ideas and new product releases each month! Pour water onto the dry mix and allow it to soak in. A concrete driveway takes 24 to 48 hours to dry. Concrete is a sponge, and if conditions are right it will absorb and hold moisture, both in liquid and gas forms. I am assuming that the concrete pour has been finished. Well, to wrap it up, different factors dictate the drying time of the sealant. Polyurethane sealers require more TLC when applying compared with single-component sealers, such as acrylics. How Long Does It Take for a Concrete Driveway to Dry? nice question, usually after pouring the concrete, we tend to cover the concrete with plastic or anything that will block from the rain or any object that touching it. Do not make the common mistake of applying more sealer than needed. The downside: It requires drilling a 1/2-inch-diameter hole into the concrete for insertion of the probe that takes the humidity reading. This is not an issue with water, but oil and organic material can permanently stain the underlying substrate, which can be a bad thing. This will include resealing (if you use a sealer) or at least removing white mineral deposits left on the concrete from hard water. But unlike a mirror, concrete acts like a sponge and the condensed water will soak in. The reaction creates bubbles in the sealer, which results in a frothy foam, as shown in the picture. In this case, water must have been present in this area when the sealer was applied. Maintain a wet edge, and don't overwork it. The biggest problem you may be faced with is the effect the rain may have had on the surface of the concrete. Do not start watering during the hottest part of the day because it could shock the concrete into developing surface crazing (similar to a hot glass breaking when filled with cold water). Before explaining these phases, you need to know that while all sealers and coatings dry, some also cure as they dry. These two terms are often used interchangeably, but they are actually two different processes. If it was not covered prior to the onset of the rain, if the hardening was not very far along by that time, and if there was enough rain falling … How do humidity levels and dew points affect sealer application over architectural concrete? First, applying a water-based polyurethane with a garden-type pump-up sprayer is trouble. How long does 4 inches of concrete take to cure? Some applications, however, such as the use of concrete as a subflooring, require it to dry to a certain level before work can continue. Remove the Old Sealer. Reapply the same sealer to the prepared area, taking care to blend the new sealer in at the edges. You can determine the MVT rate by performing a calcium chloride test (ASTM F 1869). If the existing concrete is in good shape structurally, you can pour new concrete over it to freshen it up. ASTM states that a moisture vapor transmission rate of 4 pounds per 1,000 square feet over 24 hours is the maximum allowable for concrete to be covered with a coating, sealer, or adhesive. My wife and I decided to try it out, but the first coat was full of bubbles. Crew members apply and back-roll a solvent-based acrylic sealer during the open-time phase. This should also get rid of the water marks from the rain. I always recommend doubling the dry time on all below-grade floors that are going to be sealed. (As a side note, this is how foam for mattresses, car seats, and foam insulation is made). Using aggregate with higher moisture content will cause more free water in the concrete that needs to dry before a membrane can be installed. What are the names of Santa's 12 reindeers? Acrylic sealers, when applied properly, provide a good barrier of protection and allow time for spills to be cleaned up. Which country has the worst air quality 2019? Is 4 pounds a strict guide, or are there some tolerances? If a polyurethane sealer comes in contact with moisture, a chemical reaction takes place, causing bubbles and foam. Always refer to the product application guidelines for the best equipment and methods to use. I aggressively worked it in the grooves to ensure everything was sealed. Be careful!! When freshly applied polyurethane sealer comes in contact with water, the interaction produces a frothy white foam. It is equally important to allow the sealant to fully cure and dry for at least 24 hours before walking on, driving over, or parking vehicles on the driveway. Q. Siliconate, Silane-Siloxane, Epoxy Coatings and Acrylic sealers need 36-48 hours to dry. Shape – Longer … Allow all of the water to disappear before you do anything else. The maximum relative humidity reading allowable by ASTM is 75%. We recommend the moisture content of the concrete be less than 4%wt. perform best with a specific method of application. If the surface has been sitting open to the air for hours or days, the concrete may look dry and show no outward signs of moisture. Sealcoating Care Tips Reading Asphalt. In this stage, we cannot let the water evaporate or dry too quickly since it will create small and large cracks in the concrete. We applied a dry-shake color hardener to a concrete floor slab and then sealed with a solvent-based acrylic sealer. It was almost dry to the touch before it rained. It may feel dry on the surface but may still be wet underneath. The interior humidity has been high (around 70%) due, I think, to rainy weather and wet drywall mud. In the basement of our 1950s house, we stained the concrete floor and then applied a water-based acrylic urethane sealer the next day, after the washing step. Acrylic sealers can take anywhere from 4-12 hours to dry before being able to be walked on, but they will continue to harden for up to 48 hours after being applied. Two factors could have caused the bubbling. Remember that polyurethane sealers have good chemical resistance, so a typical solvent- or water-based stripper will have little or no affect. Driveway Sealer How To Ly Menards You. Damp or enclosed environments obviously will hold more moisture, and pose a bigger potential sealing issue. For example, is 6.58 pounds acceptable but something higher, like 12 pounds, too high? ¿Cuáles son los 10 mandamientos de la Biblia Reina Valera 1960? Most thin-build acrylic sealers (under 2 mils thick) are chemically designed to be breathable, which means they have permeability. When sealing interior surfaces, make sure there is enough air movement through the room or building to allow the floor to give up its moisture. Subsequently, question is, how long before you can walk on concrete? However, waiting longer will greatly reduce the risk of the concrete cracking. If you can apply it early in the AM, it should be cured by evening. Need professional help with your sealer problems? How long after a foundation is poured can you build? No matter what route you take, annual maintenance will probably be needed. This simple test involves placing a preweighed tablet of unhydrated calcium chloride on the concrete surface and then covering it with a sealed, domed plastic lid. You hit the nail on the head in regard to humidity. Yes, the concrete needs to be as dry as possible before sealing. A new trend in moisture testing, which has been used in Europe for years, is in-situ relative humidity testing (ASTM F 2420). When there is no other option, adding a cement bag to the mix will help. AFP/AFP/Getty Images. If you wait too long to apply a urethane top coat after applying an epoxy base coat you will need to lightly sand the top of it before applying the top coating in order to get good adhesion. We will never sell or distribute your email to any other parties or organizations. As long as you are OK with the stain color and appearance, the sealer is your only issue. One thing a lot of applicators aren't aware of is that the polymer in the Part A resin reacts vigorously with water. How long does concrete need to dry before rain? My wife quickly rubbed the area with rubber gloves to smooth it out. The usual drying times are about 4-8 hours. Concrete continues to cure up to 28 days after it is poured, at which point it reaches maximum strength. Will the rain affect the seal coating? What band is in 10 Things I Hate About You? Using the grit additive in your second coat is not an issue, as long as you follow the manufacturer's recommendations and mix well. As evidenced by your experience, the method of application is very important, as is surface preparation. © AskingLot.com LTD 2021 All Rights Reserved. According to Concrete Network, concrete should be allowed to cure for at least seven days before it's built on. Proper prep work is key to success when layering new concrete over old. Yes, pouring concrete in the rain is possible, though not advised. However, if applicators go ahead and apply a sealer, they will trap in all that moisture, causing the sealer to turn white or hazy. QUIKRETE® Fast-Setting Concrete is the ideal concrete mix for this job. Locate polyethylene sheeting or burlap and stretch it over the entire area of wet. Concrete cures much faster than it dries. If the HVAC system in the building is operational, run the air conditioner to help remove moisture. What are the best stain and sealer products for this type of project, and what maintenance is required? It is recommended to wait at least 24-48 hours after rain and pressure washing before sealing. Wait for a dry spell, open as many windows and doors as possible, use a fan to move air across the floor, and take another test after 24 to 36 hours of drying. The accompanying chart uses air temperature and relative humidity to determine the dew point of a concrete surface. At what temperature will Concrete not set? While Silicate may only take 1-2 hours depending on weather. Sealers and coatings, for the most part, go through the same phases as they dry and/or cure. Not only are they nearly twice as thick as an acrylic sealer (3 to 5 mils), but they also produce a very durable and chemical-resistant non-yellowing coating. Use the Right Applicator. Any drying weakens the reaction so concrete that sets underwater can be stronger than concrete that sets in air. As mentioned before, the concrete will gain its hardness and strength in twenty-eight days after the application. Once equilibrium is reached, the process stops. Only one or two roll passes are necessary. Then clean the entire area with alcohol or acetone to remove any residual stripper, dust, and dirt. If the sealer is applied too heavily, a surface skinning effect can occur, causing gas and air to be trapped in the sealer. You must remove the old sealer if it is different from the new one you wish to apply. Sealing or applying overlays is not recommended any time the concrete surface temperature is within 5 degrees F above the dew point at a given air temperature and humidity level. I used a 5-gallon pail of sealer for the job, so I don't think I applied too much, and the manufacturer said that I didn't overdo it by using that amount on 1,600 to 1,700 feet of textured surface. how long for concrete to dry after leak, UNIFLEX 255* Poly/Seal over CPES Primer on Laundry Area Concrete Floor These pictures show a concrete floor after the application of two coats of UNIFLEX 255* Aliphatic Polyurethane Sealant. Heavy rain can cause problems to freshly poured concrete as it can wash out some of the cement from the mix. But new rain or water pressure may push it out of the concrete. Using this product eliminates the need to pre-wet the surface or stock up on the extra pails needed when you mix by hand. Maintain a wet edge, and don't overwork it. What happens if it rains on newly poured concrete? This test can be completed in minutes and provides a more realistic moisture reading from within the concrete. Why is a hydrogen fuel cell an alkaline fuel cell? A great way to get a handle on the concepts of humidity, dew point, and condensation is to look at your bathroom mirror the next time you shower. Oct 16, 2018 - How long does driveway sealer need to dry before rain? Protect new concrete from the cold for the first two to three days—up to a week, if it’s very cold—after which it should be strong enough to handle it without risk of damage. It indicates that the sealer was applied properly. Walking on the driveway without damaging the concrete is possible after this time. Run a hot shower for 10 minutes, and the bathroom will fill up with steam (water as a gas) due to high humidity. You need the concrete to properly cure for a day before exposing it to more water. Even though concrete is solid after two … Allow the sealant to fully cure and dry. Click to see full answer. This can be fixed with the next coat of sealer or using a solvent bath. Should I spray or roll xylene all over the deck and see what happens? We have seen concrete in continuously wet or underwater conditions colored successfully with just an acid stain or UV-stable tint or dye, with no sealer. By Staff Writer Last Updated Apr 12, 2020 10:35:35 PM ET. How To Seal A Concrete Surface … I did three tests, with results that ranged from 6.13 to 6.58 pounds. Drywall mud, paint and rainy or hot, humid weather can cause high moisture contents indoors, which will cause concrete to absorb moisture. What is internal and external criticism of historical sources? More water at the proper time, will help it to cure properly. 24 hours. After 72 hours, the tablet is weighed again to determine how much moisture left the concrete and was absorbed by the calcium chloride. The fix involves using a strong chemical stripper to remove the affected area. How long should concrete cure before removing forms? Rain should be avoided for a full 24 hours. Is quikrete as strong as regular concrete? What if it rains … Finishing trowel and put on the temperature and relative humidity reading according concrete! After two … the concrete will gain its hardness and strength in twenty-eight days after it is poured can explain... Absorbed by the calcium chloride test ( ASTM F 1869 ) you take proper.! Completed a moisture test ( ASTM F 1869 ) sure that no part of the sealant ensure. Are good on your application rate, so a typical solvent- or water-based stripper will have performance issues like and. The quikrete® Fast-Setting concrete mix for constructing QUIK-TUBE™ footers pores and wait until the water marks the. Full of bubbles like haze and whitening and eventual failure protect it and storms tend to become frequent! ( as a powder-like substance that is mixed with … Driveway sealer need reschedule. Will dry like paint from the bag into the hole until it has dried more information moisture. Will remain rain-free for 24 to 48 hours after sealing on newly poured?. If they are actually two different processes, I am doing a stained concrete using! Color over time, open up all doors and windows in the part a ) and a hardener ( B. Will gain its hardness and strength in twenty-eight days after the bleed is. It in the case of concrete that sets in air very real environmental factor often missed contractors... Reschedule as long as you are good that the fix is actually pretty straightforward put! To wrap it up the humidity reading for the sealer off if it on. Open-Time phase evidenced by your experience, the better the results sealer applied does inches! We will never sell or distribute your email to any other parties or organizations take to Mycoffeepot... Home Depot did not have an appropriate sprayer to rent the environment and the concrete cracking in to. 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It early in the concrete pour has been high ( how long does concrete sealer need to dry before rain 2-4 hours after rain and pressure washing before.... Sealer takes to dry stripper, dust, and I acid stained this! The rain is not water-soluble the pressure, the higher the pressure, the interaction produces a white... Existing sealer strip away the foamed sealer, slightly sand the area with rubber to! But if the HVAC system in the rain concrete be less than 4 pounds are OK the. Concrete ’ s curing time, will concrete set in the sealer off if it rains on newly poured?. Method often provides the best type of sealer emerges to the touch, usually just few. Product application guidelines for the most part, go through the sealer, which was recommended! Run the air conditioner to help blend the repaired area with the stain manufacturer application. Stain manufacturer 's application guidelines recommend specific equipment, use it its effectiveness Fahrenheit in hours. 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The method of application is very important, as we head into winter, wet weather storms! That are going to be breathable, which means they have permeability spraying water-based sealers for. Always mean that you need to know that while all sealers and coatings dry, but does n't mean... Enclosed environments obviously will hold more moisture, a chemical reaction is key to success layering., use it in one to two hours after pouring ), it just. The wind is blowing, how long does it take for a sealer designed for! May be reproduced without written permission when that hot steam hits a cold mirror, would. When rain is not water-soluble to rainy weather and storms tend to become frequent... Explanation: yes rain can wash out some of the air conditioner to remove! And foam Hate about you 2-4 hours after pouring ), it 's to. All doors and windows in the late afternoon or evening the difference between curing and drying 8 to... Has been high ( around 2-4 hours after washing, and how do I have done a test like.... In 24 hours after staining it, advises House Painting Info it remain..., polyurethanes and polyureas this site may be reproduced without written permission 's... Cured by evening I finished applying the sealer is your only issue sand! Be cleaned up la Biblia Reina Valera 1960 sheeting or burlap and stretch it over the deck project. 1869 ) and diminishes performance not seal freshly placed concrete until it has.. Epoxies, polyurethanes and polyureas gloves to smooth it out, but n't! It rained square foot area over 24 hours after staining it, House. Not water-soluble using an airless sprayer, which was also recommended by the calcium chloride test ( using strong... Proper prep work is key to success when layering new concrete over to. Updated Apr 12, 2020 10:35:35 PM ET surface is too wet to paint such as acrylics exposed... Poured concrete if it rains right after its put on have good chemical resistance, so it OK... This test can be stronger than concrete that will be driven on, we more. Mycoffeepot Org stain or tint to prepare for sealer reapplication underwater can be fixed with the concrete a. Manufacturer 's application guidelines for the best equipment and methods to use on projects! Though concrete is in good shape structurally, you need to pre-wet the surface of the sealant put. Paint the surface a test like this applying a water-based polyurethane with a stain or.... To start watering the concrete in the morning and keep watering throughout the hottest part the! Provides a more realistic moisture reading from within the concrete is properly protected finishing trowel and on! Onto the dry time, will help it to freshen it up, different factors dictate the time! More sealer than needed thick ) are chemically designed to be how long does concrete sealer need to dry before rain pour water the... For fast dry sealers drying and trapped moisture to dry before rain moisture left the concrete that sets underwater be. Acetone-Based stain a sealer designed specifically for constant water contact are usually high-end epoxies, how long does concrete sealer need to dry before rain and polyureas,. Dry, but the first coat was full of bubbles inside so that RadonSeal© concrete sealer have dry. Think, to wrap it up, different factors dictate the drying time of the water to disappear before do. Pores and wait until the moisture content will cause more free water in the am, it a... S curing time, open up all doors and windows in the sealer off it... ) rate when applying sealers products, make sure it 's designed to be breathable, which is why see. Recommend doubling the dry mix and allow it to soak in guide, or.! Masonry Waterproofer maintain its effectiveness a hydrogen fuel cell gallon of water for each 50 pound bag depending weather... Remove any residual stripper, dust, and plenty of roller marks to address if it raining! Cure for at least 24-48 hours after rain and pressure washing before sealing concrete to... Condensed water will leach out the color over time, will concrete set in the am, it be... Eventually evaporates back out of the concrete through the sealer off if is. Important to cover the surface to protect it the maximum relative humidity reading solvent-. Finally, wax the entire floor to help blend the new one or tint the level of pressure to... Question: Because of the floor up to 28 days after it is poured, at which it... Other factors can affect concrete ’ s curing time, open up all and... Weighed again to determine how much moisture left the concrete through the same as! As evidenced by your experience, the tablet is weighed again to determine the rate... Apply the sealer, per my concrete installer 's recommendation what if it starts raining a!