how to apply concrete sealer image

When to Seal & How to Seal Concrete | Step-by-Step Guide for Perfect Sealing

Have you ever applied sealers in concrete areas? Apart that, does concrete even need to be sealed? Indeed yes, it protects the area from constant sunlight, rain, and abrasions. Concrete looks best when cleaned, and the plain surface comes out. However, you need to maintain the sealers to keep the concrete durable. There are application processes by which sealers are applied over the concrete. The products or materials used in concrete applications differ in price and availability. Read more about the step-by-step guide on how to apply concrete sealer and its correct time.

How to Apply Concrete Sealer?

It is important follow the proper guidelines while sealing concrete floor. Below is the best way to seal new or old concrete floors.

concrete sealer before and after image
Concrete Sealer Before and After

Step 1: Remove All Oil, Grease, and Stains from the Concrete

It is essential to clean the surface before applying sealers. First, sweep away all the dust particles accumulated on the concrete if there is any grease or oil, deep clean it using stain removers. Putty knives are handy in scraping off excess grease. Concrete cleaner solutions are available to remove nasty spots. Remove stains before putting concrete; otherwise, new sealers will not work properly. After removing all dirt and stains, mop it dry using vacuum cleaners. Allow the surface to dry completely for about 24 hours. Fill the existing cracks before putting in new sealers and smooth the area with a putty knife. Guidebooks are always available to help you out.

Step 2: Remove Existing Sealers

It is the right time to remove any old sealers from the concrete. First, make sure about the sealer usage by pouring one large cup of water. You will notice that water stays above the surface and does not seep in. This means that sealer was already used. Next, remove the sealers carefully by sandblasting. Of course, this complicated method is not for beginners because you can damage the concrete if done wrongly. There are chemical strippers available that are highly acidic.

Always use protection for your eyes and hands. It is better to use environment-friendly products because the power is mild in these alternatives. The working hours increase for the sealers to remove. The strippers are applied using a brush or spraying the concrete evenly and putting a thick coating on that. The duration of this application process is unknown to many so take help from professional persons.

Step 3: Scrap the Surface and Dry it

After putting it on for some time, you will notice bubbles appearing on top. This phase means that the sealer has been softened. Scrap out the sealer using scrapers and throw it away in the dustbin. It contains harmful chemicals so it is not safer to have it in your surroundings. The disposal method should be correct to prevent any infections. After removing the sealer, scrub the floor with a mixture of TSP and water. Vacuum is applicable for cleaning the rest of the floor. Give 24 hours to this surface again before applying new concrete sealers.

Step 4: Apply First Coat of New Sealer

After removing the old sealer and drying it properly, it is time to apply a new one. The longevity of the sealer depends on how porous the floor is. First, apply a thin layer of the first coating and let it dry for 2-3 hours. After the time is over, check the durability of the sealant. If it is dried up completely, then go for the second coating. This will make the concrete floor look flawless and glass-finished.

Step 5: Allow the Sealer to Fully Dry

You should remember that if sealers are required for the interior concrete floor, allow plenty of air to come in. otherwise, layers will remain raw and will not dry. To make the coverage stronger, apply the second sealant coating and wait to dry. After allowing 24 hours, check the surface repeatedly.

A new sealant application process is quite tough, so it takes help from professional contractors who can do the work more easily. If the sealant not applied properly, then water will soak. Without taking care of it, the surface will become brittle. Do not apply a thick layer of concrete sealers because it will make the surface uneven. Instead, make sure to apply two layers of sealers generously to look normal. Apply the first coat in one direction but the second coat in the opposite direction. This will make the sealant cover the concrete surface fully. Always dry the layers first before applying the next one. Concrete sealers take up to 3 hours to dry up completely, even in hot weather.

When to Apply Concrete Sealer?

Do not hurry to step on the concrete sealers immediately after applying. Give it time to cure, like 28 days or more. The best time to apply sealant is dry; otherwise, it will not stick properly. Concrete sealers take time to dry up, so application in swamp areas will not give good results.

  • Look after the temperature if it is above 50°F during sealer application.
  • Keep the area dry and clean after the application of sealers.
  • Check the weather before applying concrete sealers; otherwise, adhesion will cause a problem.
  • Keep rollers or sprayers ready for the application process
  • Sealers that contain acrylic resins should be applied immediately to the new concrete surfaces
  • Apply sealers in the late afternoon because moisture gets evaporated throughout the day from the surface


Hope these sealing concrete steps are helpful to seal your floor. There are different types of concrete sealers available for different surfaces. All of these sealants have their own curing time. Therefore, avoid problems like discoloration or premature evaporation while applying sealers. The best type of sealer depends on how you want the surface to look and the time for resealing it. Choose according to your needs and preferences, so money does not waste.