Hello!

Hi!

If you only need the mould -facing surface to be perfect, and the curvature of the part is very slight, then you can do two prepreg "skin" parts from the mould, then key one on the outside and use as the inner "skin" 
You can then use a thin rolled on (or even sprayed) layer of laminating resin on the two "skins" and compress the whole "sandwich" back in the mould, just using flat bags of sand to keep the sandwich together ..

Good luck

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