What's wrong with a soldered tank repair ? That's how the gas tanks are usually fixed or hell , sealed from the factory when your car was new. Has it been leak tested ? If so and it has no leaks it's good to go...I do not trust the epoxy method with today's gas, it can and will fail....Now if I had a plastic tank and the right epoxy yes I would feel safe . Plastic types have to match the type of epoxy used. For metal gas tanks best repair is either welding or soldering, along as the tank is fume, gas free and done by some else....(No Boom , boom...)