Surface sealers for exterior
applications should be acrylic to allow moisture in
the slab to escape. Solvent-based acrylics generally
perform better than water-based products for outdoor
use. Silicone-based penetrating sealers are recommended
for applications where a shiny or wet look is not
desirable. A good indoor application consists of one
coat of solvent-based acrylic followed by a topcoat
application of water-based acrylic. Floor maintenance
can be performed with additional applications of water-based
acrylic sealers or waxes.
For interior slabs, three primary types of sealers
are used: acrylics, urethanes, and epoxies. Acrylics
are UV stable, inexpensive, and easy to apply or reapply,
as necessary. But they have the softest surface of
the three and require the most maintenance. Solvent-based
acrylic sealers are softer than water-based products.
They also provide a wet look that greatly enhances
the appearance of colored finishes.
Epoxy sealers are much harder than acrylics. Water-based
epoxies bond well to concrete and provide a clear
finish, but they are nonporous and do not allow trapped
moisture to escape. Epoxies are probably the best
choice for concrete countertops and food-preparation
areas. They are not UV-resistant, and reapplication
involves more elaborate preparation than for acrylics.
Urethane sealers, though the most costly, provide
the most abrasive-resistant finish. However, they
don’t bond well to concrete, so they must be
applied over water-based epoxy applications. They
are not UV-stable, and reapplication is expensive
continue – Concrete Stain Pricing