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I would recommend sanding it first with a medium to fine grit sand paper. You dont need to primer if you are using krylon fusion paint. ALWAYS apply thin coats. That is one mistake alot of people make is way to thick of coats. Allow proper drying time, do not rush it "be patient". After you get a few coats on, do a little wet sanding. After wet sanding wipe it down and apply a couple more thin coats. Then wetsand one more time and apply one more thin coat. Clear coating is not needed but doesnt hurt.