A high quality, water resistant, sealer formulated for priming porous substrates prior to the application of Mirro-Mastic. Use Bond to seal substrates such as drywall, wood, concrete, concrete block or brick. Bond penetrates deeply into the substrate providing a strong permanent adhesion between the mastic and substrate. It is not necessary to use Bond on nonporous substrates, such as glass, tile or metal. Use only with Mirro-Mastic.