Yes light 600 grit wet sanding Is the way to go before paint. Mainly what I am saying also Is that more than likely you will or have painted over gel coat unless you sanded It all off to the glass.
Nothing to freek out over or anything
But I thought I would point out the mold release Issue. Most people do not know about It. It's best to try and cut It down with the proper degreaser just for gel coat from your local body shop supply.
Nothing to freek out over or anything


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