Is it possible to spray 2k clear into uni mould surface wait to dry and then use epoxy infusion resin?

When I mould parts with Duratec as an in mould coating I still also spray a clear polyurethane on the finished parts too.

Yeh agreed, this is the best way. The Duratec gives a nice non-porous surface to sand and apply the polyurethane to, and the polyurethane provides the UV protection.

Unfortunately it is also the most costly and labour intensive, as well as the heaviest option.