Rather than have to build around a higher than expected spot can I hammer down the spot while I am in filler and continue to sand down to have less fill, or am I asking for trouble doing this? Second pic shows a trunk area that was pretty beat up. I have got it sanded down to ready to do primer again. as you can see I have several higher spots. If I can knock them down before priming again and keep sanding till I have taken more filler down I can have a bit less work to do to finesse things after the epoxy primer recoat. Ok to do?
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