By 4age - 12/31/2019 8:20:44 AM
Hi
I am currently building a Datsun 240Z and wanted to make some of the parts from carbon fibre. The body shop repaired all of the body parts, sanded them and primiered them ready to be painted.
This is how it is now. 
So that the mold won't stick to the primer what is the best thing to do? Do I have to paint the parts or atleast clearcoat them?
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By Hanaldo - 1/13/2020 2:55:55 AM
Guys, with advanced composites always keep in mind: there's no shortcuts. You get out what you put in, so if you start cutting corners it will always reflect in the end product. Whether that is acceptable to you or not is up to you, but don't expect things to work flawlessly if you try to branch from the tried and tested.
Vinyl wrap is not a suitable surface for mould making, any gelcoat containing styrene will attack it. The most appropriate solution if you really don't want to paint the primed panels is to spray PVA release agent, which then forms exactly the 'stretch cling film barrier' type of material that Cliff is seeking, and washes off with water when you are done. Yes, it will effect your surface finish with bits of dust and an imperfect gloss, you will need to refinish your mould if you are wanting perfection. It does spray pretty well with a bit of practise, so if you can keep the dust out of it then you may only need to rub the mould back with 1200 before compounding.
I would always paint the primed parts before moulding and use a chemical release agent to get a perfect mould straight off the pattern. PVA does not work as well, but it is the one shortcut that I would consider if budget was the priority.
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