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HI,
Looking at your pictures I can see 2 problems.
First off is the bridging around the bolt recesses. That is likely where you were unable to get the carbon to fully conform to the tight edges. The way around that is to basically cut a hole in the main pre-preg piece for the recess then apply a patch of pre-preg to the reverse. You can cut as necessary then to get the pre-preg to conform nicely to the bolt recess and thus avoid the bridging voids you can see.
Secondly, the mould appears to be Uni-Mould. Uni-Mould is not designed to work for the XPREG system. You exceeded the Uni-Moulds design HDT with the cure cycle you did, so you are lucky you did not have more problems or mould damage. We have a very low temperature cure cycle for the Uni-Mould system with XPREG in the processing guide, however, as stated there, we do not recommend it as working with vinylester, you do not get the best results, which would explain the pin holing you have.
The side of the pre-preg only makes a tiny difference. The paper side is the mould facing side albeit it rarely makes a noticeable impact.
Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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