A little late to the feedback game
but oxidation is a minor, easily remedied thing. Gelcoat
cracks could be cosmetic (crazing) or indicative of underlying fiberglass
substrate failure, requiring a major repair depending upon why it failed. If it's the latter, you should be able to press hard on the area and try to detect any movement, or even visually see flexing. Gelcoat
over time may craze (cosmetic surface cracks) due to various working forces on the hull
, component (wherever it may be). Sometimes the de molding process itself (pull the newly cured fiberglass
part from its mold) will cause the crazing depending upon the design and quality control of the manufacturer. Other situations may be due to gelcoat applied too thick during manufacturing. Remember Gelcoat is brittle, so 15 to 20 mil thickness is the target when it's sprayed into the mold
. More than that and it's subject to crazing. Still most likely a cosmetic issue though.