I have never worked with fiberglass before, but am reading up on it and have watched the videos on marine fiberglass repair.<br /><br />I have several dings in the hull, one that is about the size of a half dollar, with the mat showing through, the gelcoat is completely gone. Several other scrapes on the center line bottom, due to bad rollers which I am repairing too.<br /><br />Do I need to repair by adding mat or do I simply repair the gelcoat? One of the videos indicated on a similar fix using gelcoat with ground fiberglass particles in it I believe- would that work.<br />the damage is on the very upper corner of the stern of the boat- don't ask how it happened its a story for stupid human tricks! No cracks anywhere near it just this mashed in part.<br /><br />Thanks in advance<br />Joe