Henkseal® Waterproof Aquarium Silicone Sealant for Safe and Secure Aquatic Life 300ml. Non-Toxic & Safe: Specially designed for aquariums, non-toxic and harmless to aquatic life. Fast Curing: Cures within 24 hours, significantly shortening construction time. Excellent Waterproof: Effectively prevents water penetration and leakage for secure sealing. Strong Adhesion: Firmly bonds glass and plastic to ensure structural stability. Crystal Clear Finish: Completely transparent after curing, maintaining aquarium aesthetics. OEM/ODM Support: Accepts OEM/ODM orders with custom logo and package design. Free Samples: Free samples available for quality testing (shipping cost applies). Comprehensive Certs: Certified with MSDS, TDS, REACH, ROHS, SGS, TUV, and ISO9001.