Dap 00686 Gasket 100% Rtv Silicone 2 Raw Building Material, Black Resists cracking, crumbling and chalking. Cured sealant is mildew resistant. Indoor/outdoor use. Meets ASTM C920, Specification C719, Class 25. Easily forms 100% silicone rubber gaskets for mechanical repair and household use Permanently flexible Waterproof seal won't crack, crumble or dry out Requires no mixing Black