I have a fiberglass cover on my truck. Most of the ones I have seen you can see the fiberglass/resin, especially with certain colors they tend to show up more.
I would think to remove it would be to block it down smooth and apply a skim coat of body filler,sand, then shoot it with a sprayable filler (Z-chrome or something comparible), then 2k primer, sand, wet sand, shoot with color/clear.
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