Before Applying a Caulk/Sealant, Do I Need to Prepare the Surface?

Yes, it is important to adequately prepare surfaces. Surface preparation should be done within 24 hours of the application of the product. Different surfaces require different preparations:

  • Concrete, Masonry, and Stone: All contaminants and impurities must be cleaned off, and can be done so using a wire brush.
  • Porous Surfaces: Create a clean surface using sandpaper or a wire brush.
  • Glass, Metal, and Plastic: Clean the surface with a solvent such as mineral spirits and then wipe it dry with a cloth.
  • Note that silicone sealant should not be used on any galvanized surface. If you are using silicone sealant for other surfaces, do not clean them with detergent or soap and water.