The same strength silicone used to manufacture new aquariums is now available for use at home. Includes twist-on easy cap for easy application of long-lasting bond. Permanently flexible and does not crack or shrink. Waterproof seal stops leaks. Non-toxic formula for use on fresh or saltwater aquariums. Sealant cures in five minutes and fully bonds within 24 hours.? Buy Silicone The Smart Way (1oz Tubes) Never Run Out Of Clear Silicone II Again 1 oz tube 100% pure Silicone II ? Aquarium Safe ? Marine Grade ? Food Grade ? High Heat ? Electronic Grade ? This Is The Same Stuff NASA Uses ? Made In USA ? Shipped First Class Mail From USA ? Packed In Generic 1oz Tube Fresh From The USA Factory ? Have It On Hand When You Need It Most people buy a large tube of silicone and use 1 ounce. Then when they need silicone again they go back to the large tube to find it has cured in the tube and is now useless. Unopened 1oz tubes will last for years!!