Use a thick layer of gelcoat on the finished piece and get that smooth. It's easier to get the finished product smooth with a bit of sanding and bodging than it is to make the mould/buck smooth and transfer that smoothness to the finished product.
Yeah, that's a reasonable idea - a good gelcoat on the inside, you can always sand and clearcoat the outside for aesthetic properties
@mcmyk started
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Use a thick layer of gelcoat on the finished piece and get that smooth. It's easier to get the finished product smooth with a bit of sanding and bodging than it is to make the mould/buck smooth and transfer that smoothness to the finished product.