Used the vinegar on very light rust and totally screwed up my tank. MASSIVE rust. Now I am having a buddy de-rust it with por-15 rust remover which didnt work so well and he ended up sand blasting it. Still have small areas of light rust. When using sealers, how do you get the excess out and how does one deal with the fuel petcock and sending unit that are full of tank liner?
The directions for Caswells say to let it cure out upside down, I assume for that reason.
I recently did a tank that was pretty pinholed down near the petcock area so I let it cure out sitting upright so it would be thicker down there.
I forgot to go pull the duct tape off while it was malleable, but was able to remove the epoxy anyway by using a utility knife.
Worst case you could just drill it back out.