Tough: Survives routine scrubbing with household cleaners, including abrasive cleaners. Instantly waterproof: No waiting and wondering necessary. Use the sink or shower right away. Cured sealant is M & M resistant: Keep unsightly and unhealthy growths where they belong - in a lab, not on your caulk. Super elastic: When the surface moves, Lexel moves. No cracking, tearing, or pulling away for a lasting, permanent seal.