Hi,
A polly-urathane varnish sprayed on will bond very well if it is keyed well, ie waterpapered well. It does go hard and is very glossy and is also quite UV stable. I repaired my Epic and clear coated it 3 years ago with the urathane varnish and it looks better than the rest of the ski, so quess what I have to do?
Regards,
Wally