Glass panels are used to build glass aquariums asi aquarium sealant, and a silicone-based sealant holds them all together. The asi aquarium silicone sealant maintains the connection between the glass panels and creates a waterproof seal. Occasionally a new aquarium sealant will leak as soon as you fill it up if the factory seal is not fitted properly. Ageing aquariums that have been moved around a lot are also susceptible to seal leaks.