Heres a clip i edited from car dent repair 4, it shows how much filler and to work out how far to spread it, to get a straight panel. and types of primers to use so your not boggin on bare metal
by DIY How To Paint A Car School
by Autobytel
by Mommy2TwoBoys
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by Dent Time - San Diego Dent &
by Alexandros Kalemis