Dap 18275 DYNAFLEX 230, White 100% Waterproof Window, Door & Trim Sealant, 10.1 oz DAP DYNAFLEX 230 delivers a "Silicone Tough" latex formulation for outstanding exterior performance against the elements. Developed for flexibility and crack proof performance, this sealant endures expansion and contraction without cracking or losing its seal. The paintable, durable sealant can fill gaps up to 1" wide and the cured sealant is mold and mildew resistant. It has excellent adhesion to a wide range of building materials including wood, MDF, PVC, polystyrene, and composite trim board. Meets ASTM Specification C920, Class 25. Combines silicone performance with latex ease of use Permanent adhesion and flexibility Cleans up with water Paintable Meets the performance requirements of Fed. Spec. TT-S00230C, Type II, Class B (Clear: Class A)