The ‘Gold Label’ Pond and Aquarium sealant is the most versatile silicone on offer, it is fish safe, able to seal underwater (providing dirt and grease is removed from the liner or tank), solvent-free, and can bond to all surfaces. This 290ml version is suitable for use within a ‘trigger gun’. Key Features: Fish safe. Able to seal underwater (providing surfaces are clean). Solvent-Free and can bond to all surfaces. Black & Clear colour varieties. Can be painted over after 4 hours. Full curing time of 36 hours