Formulated without solvents, additives, or fungicides, Seal/Fix Aquarium Silicone ensures a safe underwater environment. Trusted by professionals and hobbyists for creating and repairing aquariums.Safe for Fish & Aquatic Life Formulated without solvents, additives, or fungicides, Seal/Fix Aquarium Silicone ensures a safe underwater environment. Trusted by professionals and hobbyists for creating and repairing aquariums. Our waterproof aquarium sealant delivers a strong, elastic hold that prevents cracks and shrinkage. Perfect for sealing glass seams, patching leaks, or attaching tank accessories securely. Seal/Fix cures quickly when exposed to air—skin forms within minutes, full cure in 24 hours. Designed for efficient application, with a smooth finish and minimal wait time before re-filling your tank. This transparent silicone is ideal for aquariums, terrariums, and vivariums. Use it to repair, seal, or affix decorations on non-porous surfaces like glass, tiles, and metal — without affecting your tank's aesthetics. Flexible in extreme temperatures and resistant to UV, moisture, and ozone exposure. Whether you're sealing a warm saltwater tank or a cold freshwater setup, Seal/Fix keeps your aquatic habitat protected.