What is the difference between a water repellent and a sealer?
A. A water repellent is not to be considered a waterproofing sealer but like its name a water repellent repells water entry into the substrate by penetrating and filling voids. Water repellents are breathable or permeable. After application most water repellents are undetectable. The service life of water repellents varies greatly. A sealer can be a waterproofing application and in lieu of penetrating into the substrate, a sealer generally forms a waterproof film on the substrate. Sealers are non-permeable and most create a sheen or darker appearance substrate.
