Hi!

It depends which clear coat you use and the prep beforehand. I have heard that Marineware in conjunction with a boat builders on the south coast of GB have successfully developed a way of clearcoating the entire boat hull prior to layup so it is possible. I'm 98% sure they use Durepox.

Apparently when it de-moulds it literally booms like a cannon and sends static sparks around like inside a plasma ball, 50m+ boat demould...  nice...