DAP Weatherproof Patching Compound is formulated with innovative Weather Max Technology for long-lasting, all weather protection. Weatherproof Patching Compound provides exceptional weatherproof protection that prevents discoloration, cracking and crumbling. The tough hydrophobic surface provides a waterproof repair that won't swell, soften, blister or breakdown and it is mold, mildew & algae resistant making it perfect for areas with continuous exposure to the elements. It has strong multi-material adhesion to tough porous and non-porous materials making it for exterior applications such as the installation, finishing or repairing of fiber cement siding, PVC trim board, vinyl siding, metal, composite, concrete, brick, wood and more. 2 to 4 hour dry time. Application temperature: 40.