Rich is correct, but there is a huge risk that the epoxy will NOT bond to a
tank once it has carried fuel. Please ask the manufacturer if they recommend
their product to be used in the way you desire. I have just been through
this exercise.
Steve


"RichH" wrote in message
...
Welding is an option....

Another option is to use a tank lining epoxy, using glass cloth over
the weld seams, etc. to strengthen them. Just figure a way to cut
open the tank top and later apply a sister flange for re-closing,
etc.

I use: www.epoxyproducts.com for both potable water tanks and fuel
tank lining. Interlux Commercial Marine Division also offers tank
lining epoxies.