If by "flap disc" you meant "chocolate wheel".... then they are OK for getting off stubborn remnants. But not for stuff with bulk depth.
If by "flap disc" you meant "abrasive paint f**ker"....
I had small pin holes in my glazing putty but didn't want to put more putty to not make a mess again and I put 2 coats of epoxy primer to prevent it from rust. Though you can only see the pin holes if your eyes are almost against the panel. Do you think when the 3x coats of high fill 2k primer and 2 base coats go on that it will be visible?
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