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Classicarbon
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Group: Forum Members
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+x+xI honestly would just spray a 1k primer and then use a wax based release instead of pva. This won't dissolve the 1k primer and when demoulding in worst case you ripp off the two little primer patches off of the plug, but with a little acetone they will wash right off and leave you with a good surface otherwise. Unless the gelcoat attacks the areas of 1k primer, causing alligatoring in both. Then it's a lot of work to fix again. Fairly likely to happen. Classiccarbon, yes use any gun you like. PVA can cause it to rust out, so make sure you clean it out well if it is a gun you want to keep in good condition. Also yes, you can use spray glue (though I'm not sure why you want to if you are making a mould?). Just be careful if you need to reposition anything after sticking it down, as you may lift the PVA film. It is normally ok though. Ah yes my mistake don't need glue haha. Thank you.
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Hanaldo
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Group: Forum Members
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+xI honestly would just spray a 1k primer and then use a wax based release instead of pva. This won't dissolve the 1k primer and when demoulding in worst case you ripp off the two little primer patches off of the plug, but with a little acetone they will wash right off and leave you with a good surface otherwise. Unless the gelcoat attacks the areas of 1k primer, causing alligatoring in both. Then it's a lot of work to fix again. Fairly likely to happen. Classiccarbon, yes use any gun you like. PVA can cause it to rust out, so make sure you clean it out well if it is a gun you want to keep in good condition. Also yes, you can use spray glue (though I'm not sure why you want to if you are making a mould?). Just be careful if you need to reposition anything after sticking it down, as you may lift the PVA film. It is normally ok though.
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Classicarbon
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Group: Forum Members
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+xYeh 2k high build primer. I would always then top coat that properly too, I don't like moulding off primer as it's very hit and miss. But your call. Can also spray PVA release agent, quite reliable even on a 1k coating. But will take some refinishing to get the mould up to scratch. Is that gun Will be enough Good for PVA ? And can I apply spray glue on top of it after? 
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Lester Populaire
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I honestly would just spray a 1k primer and then use a wax based release instead of pva. This won't dissolve the 1k primer and when demoulding in worst case you ripp off the two little primer patches off of the plug, but with a little acetone they will wash right off and leave you with a good surface otherwise.
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Hanaldo
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Group: Forum Members
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+x+xYeh 2k high build primer. I would always then top coat that properly too, I don't like moulding off primer as it's very hit and miss. But your call. Can also spray PVA release agent, quite reliable even on a 1k coating. But will take some refinishing to get the mould up to scratch. I Will struggle to use 2k Primer so might need to stay with flash tape and then smooth out the mould. It really is virtually impossible to get rid of flash tape marks without digging a massive low spot in the mould. Much better off using a 1k primer and just spraying PVA release agent as Warren said.
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Warren (Staff)
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PVA will need less sanding to get smooth then trying to sand out the edge marks of the flash tape.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Classicarbon
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Group: Forum Members
Posts: 86,
Visits: 639
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+xYeh 2k high build primer. I would always then top coat that properly too, I don't like moulding off primer as it's very hit and miss. But your call. Can also spray PVA release agent, quite reliable even on a 1k coating. But will take some refinishing to get the mould up to scratch. I Will struggle to use 2k Primer so might need to stay with flash tape and then smooth out the mould.
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Hanaldo
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Group: Forum Members
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Yeh 2k high build primer. I would always then top coat that properly too, I don't like moulding off primer as it's very hit and miss. But your call.
Can also spray PVA release agent, quite reliable even on a 1k coating. But will take some refinishing to get the mould up to scratch.
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Warren (Staff)
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Be wary of any rattle can high build primers or primers. They are heavily solvent based and would need a proper oven cure to stop them degassing during the mould making process. What happens is the release agent then fails where the paint is and the mould will stick in those areas. Bodyfiller does the same too in many cases.
Properly sprayed 2k paints fully oven cured are normally ok though.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Classicarbon
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Group: Forum Members
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+xFlash tape will add thickness that is extremely difficult to polish out of your mould. You really have to fill them and then at least prime the surfaces before making your mould. Just use normal primer? Gel coat won't stick to the primer?
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