100% silicone caulk is permanently waterproof, flexible and shrink and crack proof. 3-hr shower-ready, 5-year product protection, lifetime guarantee, non-paintable. Used for showers, tubs, sinks, tile, countertops and fixtures. Meets federal specifications: TT-S-001543a, TT-S-00230, ASTM C920. The DAP CAP Caulk Finishing Tool is a handy caulk finishing tool designed to help you achieve professional-looking results every time. It forces caulk into joints, finishing and smoothing it as you go for a perfectly-tooled bead of caulk. Ideal for use around window and door frames, tubs, showers, sinks, countertops, siding, trim, corner joints, baseboards, moulding and other gaps and openings. It re-seals the cartridge for storage and reuse for all types of caulks and sealants. Creates a perfect seal on any corner or edge Can be used on any interior or exterior caulk or sealant project Works with all types of caulks and sealants Smooths away excess caulk leaving a professional-looking result When you're finished, use the DAP CAP to seal and reseal your cartridge for storage, reduced waste, and reuse Made of plastic, so it's safe to use on all surfaces, including glass tile. Bright yellow color for high-contrast visibility no matter the color of caulk you're applying.