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Hi there, which is better in what respect? If you mean as a casting medium for garage kits, then PVC is probably not a viable route. PVC requires expensive metal molds and the curing is done at high temperature. You would need to take your model to someone who could carry out that type of work and be confident that you could sell enough to cover the costs.
Resin can be done by anyone in silicone molds.
As for which is better/more expensive? I don't know about cost of PVC vs resin, but I know I would much rather build a resin kit than a PVC one.
Al
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