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I don't pay much attention to what people say on the internet. My experience goes back well before there was an internet. I'm thinking more along the lines of D.O.T. regulations. Go to any well run salvage yard. Fuel tanks are pulled, drained then stored away from everything else.
Back in the days of metal tanks too.
The local u-pull-it yards just drill a hole to drain them; not so much for possible fire hazard, although that's a concern, but to avoid the ENVIROMENTAL hazard of draining gasoline into the ground!
if you didn't properly prep the bowl, the epoxy would pop right back off.
Bowl was cleaned and sanded(on both sides,pin hole) with sand paper to allow it to "bite". Still failed, i have used it on different types of plastics and it will not adhere well to some of them. This is the generic stuff sold in the hardware stores. If you plan on using it try it on a location of the tank to see if it will adhere. That's not saying it will stay that way when gas is in the tank. I did visit their site and found this it says it is for metal gas tanks. Also says "petroleum resistant".