On Tuesday, 16 February 2021 at 08:01:34 UTC+2, Mike Carris wrote:
You do not paint over gelcoat. You remove it and start from the bare airframe.

Mike

I've never seen a painted glider that did not have gelcoat below the paint. New gliders with paint = gel coat is added to the moulds. Refinished gliders = gel coat usually sanded down but still there.

No use comparing 50 years old gel coat gliders to modern gliders with T35 crap that lasts 10 years before cracking.