It's not really wax...It is a surfacing agent that rises to the surface sealing it off temporarily from air. I believe it is styrene. When doing gel-coat repair. you have to use a greater percentage of hardener than with regular resin. Hope this helps.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"