sorry to bear this news .but the only way to repair this properly is to grind out the cracks back to the mat and then re-glass the area. then you can either re-gel or fill to bring back to surface level
you can then prep the whole panel for paint using a course grit ie 120 and prime with 2k hi build primer. anything less than this and i will almost guarantee the cracks reappearing or shrink back. (30 years grp experience)
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