DAP Ultra Clear All Purpose Crystal Clear Sealant is a premium all-purpose, ultra elastic, ultra clear sealant for sealing and patching a wide variety of surfaces and projects. Use it to seal out air, water, and moisture for a durable, 100% waterproof and weatherproof seal. Stays flexible and crackproof, even in cold weather. Crystal clear sealant is clearer than silicone, adheres to wet or damp surfaces, is water/rain ready immediately and has strong multi-surface adhesion. Exterior/interior use.