I have recently removed some fittings that were screwed to the flybridge outer fibreglass surface, leaving unsightly screw holes. to repair, I bought a can of white gelcoat (no chance to colour match, as the store had only one kind of "white"). Using a countersink bit, I cut away all of the fractured gelcoat around the screw holes, leaving a bevel. Mixed a small amount of gelcoat with a thickener, I had some "short fibre" stuff that worked well, and filled to level. That stuff shrunk a bit, so in some I gave it a second coat with thickener. In all, I gave them a coat, or two, of unthickened gelcoat. clean off with a razorblade or a sharpened scraper before the new gelcoat hardens completely. In some that was all I needed to do, as the razor edge was sharp enough to leave a shiny surface. In others, a little samding with 2000 wet/dry, then polish. Mostly they have disappeared, unless you know exactly where to look, and your colour discrimination is good enough to see the difference. On a 31 yr old surface, I am happy with the results. Takes some time, but well worth the effort.* Didn't use more than 10% of the gelcoat in the smallest can I could buy, so lots left for any other projects that come along before it hardens up in the can.
-- Edited by koliver on Thursday 10th of November 2011 09:57:51 AM