Quote:
Originally Posted by sean9c
It's a steel boat, it doesn't look like it's been faired, so it's lumpy. You're not going to be able to sand the topcoat off the low spots without, at the same time, sanding into the primer, or more likely sanding through the primer on the high spots.
Start around 80 grit, stop around 180-220 grit.
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This is the correct answer. (Just based on my professional opinion painting at a boatyard for five years)