Concrete sealants are liquid-based materials designed to protect concrete from surface damage and corrosion. Though chemical makeup can differ, there are two major types of concrete sealants: topical and penetrating.
Topical sealants:
- Sit on top of concrete slabs and form a layer that’s impermeable to moisture
- Protect the top, but can trap moisture that enters concrete from beneath the slab
- Best for interior application and smooth surfaces
- Often creates a slick, glossy surface
- Widely available
- Typically last 5-10 years, requires regular reapplication
Penetrating sealants:
- Penetrate the concrete, rather than sitting on top of it
- Can be used on more surface types
- Ideal for exterior applications
- Won’t become slick when wet
- Long-lasting because they don’t wear off the surface and are “breathable”"