AQUEON BLACK SILICONE SEALANT, 3 OZ.

"100% silicone aquarium sealant is easy to apply to stop leaks. The high-strength silicone creates a permanent water-tight seal that will not crack or shrink. It's formulated to be non-toxic, making it perfect for use on all aquariums.      Waterproof seal does not crack or shrink
Permanently flexible     Long-lasting bond stops leaks     Easy to apply 100% Non-toxic silicone  Made in the USA"