Advise wanted for maintaining gelcoat that is already FUBAR

One other thing to add, I know there are some people out there flying glass ships with pretty worn out finishes. What are your thoughts?
I've read about the gelcoat cracks continuing into the fiberglass, but I've also read about people saying they've never seen that in a career of refinishing sailplanes.
The appearance and performance degradation (which seems to be minor if not at all from SeeYou analysis) of my my finish doesn't bother me, but the idea that it would impact the safety of the glider does. Nonetheless, I feel if this were really an issue with safety, we would have seen a structural failure of a wing given how many sailplanes are out there with cracking gelcoat. To my knowledge we have not.

One other question, where's the best place to find "white catalyst" previously mentioned, come to think of it I don't even know what that is!