Reply by Kelly

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Posted on Concrete sealing question........

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2413 posts in 3422 days

#1 posted 10-19-2017 05:30 PM

Here is a page explaining the wheres and whyfores of dust on concrete floors:

Here is a quote from the page:

“For light dusting, the simple solution is to apply a siliconate penetrating sealer. Siliconate sealers chemically react with the concrete and form a calcium silicate barrier at the surface. This barrier not only seals the concrete, it helps to strengthen the weakened layer of laitance at the surface.

Siliconate sealers do not change the appearance of the concrete, but it will bead water and protect the concrete from road salts, freeze thaw damage, and even help resist stains. Application is easy and the only prep necessary is to clean the garage floor. You can learn more about siliconate sealers here.

If the dusting is a bit more extreme, but the surface isn’t so soft that you can easily scratch or gouge it with a screw driver, then you may need to take a two-step approach to stop or severely reduce the concrete dusting. This method requires the application of a densifier first and a water repellant sealer second.

Densifiers are actually a concrete hardener. They are used primarily for polishing concrete but have other uses as well, including the reduction of concrete dusting. They work similar to a siliconate sealer, but they penetrate deeper and have a stronger chemical reaction with the concrete. They can actually increase the surface strength of concrete up to 40% depending on the condition of the concrete.

Unlike siliconate sealers, however, densifiers do not form a protective barrier at the sub surface since the molecular structure of the densifier is much smaller. Because they do such a good job of making good concrete more dense, they are sometimes mistaken for a sealer since water tends to bead after application.”

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