A clear – one-part acetoxy-curing high-quality silicone sealant that provides a permanent flexible – durable – watertight seal for building of fish tanks and aquariums. The sealant is extremely resistant to UV – weathering – ageing and water – and offers excellent chemical resistance and is unaffected by alcohols – dilute acids and alkalis – soap and household detergents. The sealant remains flexible over a wide range of temperatures from -40°C to 100°C. It also performs as an excellent adhesive on non-porous surfaces where an elastic gap-filling bond is required. It has a non-sag rheology and can be applied to vertical surfaces. Bostik Marine does not contain a fungicide which may be harmful to aquarium fish.