Can withstand all weather conditions, and will remain permanently waterproof, flexible and shink/crack-proof. Typical uses: windows, doors, siding, trim, molding, baseboards, vents, around wires/pipes, and other attic/basement applications. Adheres to: most wood, metal, vinyl siding, drywall/plaster, glass, and plastic. 100-percent silicone rubber. Meets federal specifications TT-S-001543A (COM-NBS), TT-S-00230 (COM-NBS) ASTM-C-920. TYPE S, NS, CLASS 25 USE NT, G A&O TEST REQUIREMENTS.