Re: Cracks in gel coat , grind out the crack and either fill with gell coat or filler , if your going to paint the panel, use a barrier primer first some paints can react to GRP and you will need to flat it back and re fill any low spots it will look far better in the end if you take care with the flatting and filling if spraying its best to remove the panel if you can that way you dont have to deal with overspray
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