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Textured gelcoat can be difficult to polish and remove oxidization. A buffing wheel does not get in all the cracks and so the textured area remains dull while the rest of the boat is shiny. I found using a bathtub brush on a reciprocating saw works great! It doesn't put a high gloss finish on the textured area but it does remove the oxidization. I used a metal blade to cut into the handle of the brush and then used hose clamps covered in electrical tape to hold it in place.

gelcoat, polish, electric, brush