Epoxy concrete sealer is a two component system for coating interior surfaces and creates a high gloss finish. Mix part A with part B and the hardening process begins. Epoxy sealer provides a durable finish that's chemical and abrasion resistant. It makes an excellent stand alone sealer for concrete floors when applied in two coats. It can also be used as a primer for urethane coatings.
One of the biggest advantages of epoxy sealers versus other types is that most are solvent free. This means there are no toxic fumes and it won't stink the place up.
Epoxy sealers should only be used on interior surfaces. They are not UV stable and will discolor if exposed to sunlight. Also, epoxy is not a breathable coating and exterior concrete needs to breathe. Stick with acrylic sealers for any exterior applications.
There are two types of epoxy concrete sealer; water based and 100% solids high build.
The water based epoxy sealers are much easier to work with. They have a much longer pot life (2-3 times longer than 100% solids) which allows more time to apply before it gets to sticky. They are not quite as strong as the 100% solids, but ideal for do-it-yourselfers and strong enough for residential floors. Water based epoxies are also less expensive and have a much greater coverage rate.
Follow all instructions that come with the product. Make sure the floor is completely dry. Once mixed, the best way to apply water based epoxy is to spread it with a squeegee and backroll it with a 1/4 inch phenolic roller or mohair roller. The second coat can be applied as soon as the first coat is tack free, but within 16 hours for adequate adhesion and bond between coats. Estimated coverage rate is normally 250-350 sq ft per gallon. You should wait at least 48 hours before introducing foot traffic.
This type of epoxy is the only sealer that can be applied with thickness. It provides a very high gloss finish and can be used to level out textured surfaces. I don't recommend it for do-it-youselfers because it has a short pot life and there are many pitfalls. Experience is required for successful application. It's also significantly more expensive with much lower coverage rates.
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