flex tape on leaking water tank

Ralph Cramden wrote:
We keep a roll of flexseal in the boat box right next to the angle grinder and cutoff wheels. You never know when you'll get the urge to grind the boat in half.

rockwind1 wrote:
i have 2 water tanks, i think aztec brand, they are black,

Black? Are they MDPE or ABS? If they're ABS, like a Valterra brand tank, you can patch them permanently using a homemade concoction. You buy ABS pellets online (Ebay) and dissolve them into a paste the consistency of peanut butter with MEK. Then spread it on while it's still nice and sticky. Strong stuff.

If they're MDPE then flex tape may work for awhile, but plastic welding is the only permanent fix.

To make it stronger, acquire some of the pvc type screen for screen replacement on doors and windows and cut a patch a lot bigger than your crack or hole in your tank. If its a crack, drill a small hole at each end of the crack to stop the damage from spreading. Then smear the above paste over the wire patch and a little beyond, let it set 24 hours and do it all over again with a bigger piece of plastic screen and let it set for 24 hours. I do this 3 times actually. I have used this method on several tanks over the years and the patch is stronger than then tank. After patching, I have never had it leak in that spot or around it again.