All materials have a surface energy. It is a measure of how much a liquid or solid wants to stick together.A liquid with a low surface energy e.g. oil, is able to "wet" a material with a high surface energy e.g. stone. Dry-Treat sealers work by changing the surface energy at the surface of the building material so that it becomes lower than that of the liquid trying to wet it. That means that contaminating liquids such as oil and water are no longer attracted to that surface and are repelled. This is achieved by means of a semi-permanent chemical reaction between the sealer and the atoms of the building materials.