Most professionals see waterproof paints as a short-term solution to their problem. They are not suitable for basement walls and are likely to fail in six months or two years. Do waterproof coatings work? The short answer is yes. We have used waterproof coatings in basements with excellent results.
But careful preparation work is essential; the coating cannot stop water unless it can firmly adhere to the masonry. And we always recommend that you first re-qualify the landscape and add or update downspouts and gutters. Here's how to cure a wet basement once and for all. In the end, most professionals see waterproof paints as a temporary patch for their problem.
They are not suitable for waterproofing basement walls and are likely to fail, usually within six months to two years. Waterproof paint will only last six months to two years in damp areas. To permanently resolve moisture, you need to go to its source. Most paints claim to have a certain level of waterproofing properties and yes, most paints are waterproof in some way (excluding the type of nursery that sticks on the family refrigerator).
If you hire a basement waterproofing contractor, many will tell you that waterproof paint is only a temporary solution. Usually, paints based on oil, latex or concrete with organic components claim that they adhere to surfaces such as concrete or wood to provide a strong seal resistant to water or water. If the foil test showed that water soaks into the basement walls and leaves them damp, seal the inside of the walls with a high-quality waterproof paint, such as DRYLOK White Extreme Waterproof (available from Home Depot). One of the differences between a concrete sealant and a concrete waterproofing (sometimes called a penetrating sealant) is that a sealant forms a protective layer on the surface, while a waterproofing will penetrate the concrete pours and there the protective layer will form.