-put on a tooling gel coat

If you finish the plug in 2k and polish it to a high gloss then you can use a chemical release agent like Easy-Lease. With PVA you will have to flat and polish the mould back to a gloss before pulling parts. It is much easier to work on the male plug than a female mould especially if there are recessed areas like the narrow fins on your diffuser. If your using 2k then after the high build apply a few coats of black 2k direct gloss. The black will show up any scratches far better than the grey high build. That way you can polish the plug to a glass like finish.
If you mould off that using a chemical release agent you wont have to do any work on the mould before use. Tooling gelcoat cures hard and is much harder to polish than 2k.
If you use a epoxy compatible moulding system like Uni-Mould then again you can use a chemical release agent on the mould instead of PVA so the finished part will only need a quick buff to remove any release agent residue. With PVA you will have to spend time flatting and polishing to a high gloss. When flatting cf parts you always run the risk of breaking through to the cloth effectively ruining the part. For me the less work you have to do on the part the better, spend the time on the plug and the mould.

Warren

Carbon Copies Ltd