I’ve used Epoxybond Epoxy Putty for everything from its intended purpose – fixing leaks in swimming pools – to fixing a crack in the case of a garbage disposal under the sink. It’s a two part epoxy, just cut off equal amounts of both sides, mix by folding between your hands for a few minutes, and then apply. You have five to ten minutes to get in place. It’s thick, not runny, sticks to anything and works underwater! Like a rigid plastic when set. It’s relatively cheap for the amount you get, doesn’t need to be sealed up tight between uses (but it doesn’t hurt), and is available at any pool supply place or on Amazon.
— John Wolf
Epoxybond Epoxy Putty For Swimming Pool Spa Cracks, Leaks, Tile, Plaster Repair ($15)
Available from Amazon