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Group: Forum Members
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PVA is great for applications where you aren't sure about material compatibility. I use it for virtually every mould I produce off an original that I cant modify or respray with coatings I know wont react with the tooling gelcoat. Basically if you have a choice between refinishing a mould because it has defects from a PVA surface, and having to repair and resurface a mould or potentially even binning it completely because it reacted with the pattern surface - that's a no brainer.
But if you are producing a new pattern from scratch, or you have the option of respraying an original; then you should be using coatings that you are 100% certain wont react with the gelcoat you're using to make the mould, and you should be getting that surface perfect. And then in this case, why would you choose to go over that perfect surface with PVA and have to refinish the mould again?
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