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Is it a cover of an existing part that you're looking to make, were you using the wax to cover up a poor surface on the original part or, perhaps, just looking for a reliable release?
If you're looking to make a cover for the original part, an alternative might be to skin it first with a layer or two of fabric to build up the necessary size difference. Of course, this would take some work in terms of the flatting and finishing, but you should be able to get a nice surface from which to create a good mould. If the shape feels a bit challenging to skin neatly, especially around the corners, you could try using fibreglass mat, but this might be harder to judge in terms of getting a fairly consistent thickness and would likely require some filler to help get things smooth before coating
If you're just looking to improve the originals surface, then priming and painting might be the best route forwards. Just be sure to use products that will reliably stand up to the moulding process. EC sell several products that can help coat patterns well and, with careful application and finishing you can achieve a great mould-friendly surface
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