Hardman Double Bubble "Purple-Label" Wet-Surface & Underwater Setting Epoxy 5 Packs (#04003) Wet cure & underwater cure. (Surfaces can be wet or even underwater) Perfect for bonding anything that is or stays wet. (pools, boats, plumbing, gutters) Unique double packs are clean and easy to use, with very little left-over waste 2-year shelf life means epoxy will not harden on the shelf! High bond strength 2,200+psi