Before you start sanding at any level... do this first each time.
Get a plastic container (throwaway) and mix Acitone and Red Dye (use rubber gloves). Drop in a rag or sponge... and rub the bondo/ fiberglass after drying! This will give you a visual surface to sand and see what you missed. Remove all Red Dye and Repeat after each level of sanding. Be fluid with you movements. You will see the scathes from each level of sanding as you go (200 removes 100/ 300 removes 200/ etc...)
Good luck...
Peace
Drew
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