Use finer grit (higher number) paper. For this type of job I'd start out with 240, and pass on to 600 and finally 1200, which when used wet will give a finish smooth enough to apply the first coat of primer.
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Coarse paper, such as 60 or 80, is OK for wood but don't make much sense when used on metal.
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Coarse paper, such as 60 or 80, is OK for wood but doesn't make much sense when used on metal.
Use finer grit (higher number) paper. For this type of job I'd start out with 240, and pass on to 600 and finally 1200, which when used wet will give a finish smooth enough to apply the first coat of primer.
Coarse paper, such as 60 or 80, is OK for wood but don't make much sense when used on metal.