Don't underestimate the possibility of an explosion if you weld to the tank. I made a curved steel bar to go in through the filler hole to push out dents and got them to be less than 1/8" everywhere on my bashed up tank, so Bondo could finish the job well. I had to re-curve the bar a couple times to reach every dent. The tank is made of thin, easy to bend sheet metal, so pushing out the dents was pretty easy.
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