theres no reason you cannot get your bodyfiller workperfect, with that said polyester primer is best when all panels are installed and aligned and you block in between the panels, making it ultra straight, i would shy away from the lesser quality polyesters, and if its breaking up in the fup, somethings wrong. i use standox and only spray 1/2 quart at a time, it uses mek for the hardner.
and burn thrus will not happen if your body work is good, and be happy you did burn thru as it will tell you there is a low spot right next to the high.
also pull and hammer and dolly all dents, to where there as stright as possible, when you have a dent there is always a eye brow or high spot where its been pushed out, if you just fill the dent you will chase it around because you have to fill a larger area to get it all built up.
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