SturmTyger380
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If the surface is clean metal and not huge holes bondo will stick for years. It does not repel water so it needs to be primed and painted, or you will get rust under it and then it will pop off. You want a thin coat of bondo. If you are laying more than 3 mil or 1/4 of an inch you should be doing metal body work then skim coat it with bondo. Mix bondo with the hardener on a slick surface not some left over piece of cardboard. Or you will get lots of bubbles mixed into it. (Don't ask how I know. )
Once the bodo is cured you sand it so you can't feel an edge when you slide your hands over it. Then you need to put body putty on. That is goes on the thickness of a hair and fills in the small grain of the bondo. Lightly sand the body filler and clean and you are ready to prime.
Once the bodo is cured you sand it so you can't feel an edge when you slide your hands over it. Then you need to put body putty on. That is goes on the thickness of a hair and fills in the small grain of the bondo. Lightly sand the body filler and clean and you are ready to prime.
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