DRYLOK Latex Bonding Agent bonds concrete and plaster to difficult surfaces such as dense, slick or porous concrete, stone, drywall, hardboard and plaster walls. When used as an additive to concrete mixes for patching, DRYLOK Bonding Agent improves the adhesion and increases the resiliency and elasticity of the patch. DRYLOK Bonding Agent may also be used for pointing of plaster cracks