Originally Posted by Ayers

No Bondo. Use JB Weld. It will withstand the heat and its electrically conductive so the powder will stick to it.

After getting the Jb Weld slicked out as well as possible, a coat of filler powder then block sanding that will slick it all in smooth.

A gas tank with holes in the side. Notice also the undulations around the welds where there are a lot of low spots.



After JB Weld, several coats of filler powder, and then topcoat.



That gas tank was my nemesis. I never was completely happy with it. I should have just told the customer to seek a painter and saved my sanity.