Geocel Aquaria is a silicone sealant ideal for aquaria building mounting valves and sealing connections. It gives a permanently flexible watertight seal and excellent adhesion even under extreme pressure. It can be used for constructing aquaria and fishtanks in glass with or without metal frames and is ideal for repairing existing aquaria where non-silicone materials have broken down or failed. It can also be used for applying fixtures inside or outside the tank. This sealant will form a tough watertight rubber seal and is harmless to fresh and saltwater fish It provides a strong bond stays flexible and will not shrink or crack. Please note... The sealant must be fully cured before the aquarium is filled. Always read instructions carefully before use. Available in 25g 78g 310ml tubes.