I do not use PVA on the plug I just cannot seem to maintain the high gloss finish for the mold. I use PVA for the first layup in the mold. I can always fix the finish on the first part.

As I said before I never use Polyester. I use only epoxy resin. PVA and quality release waxes are not affected by different resins. So far for me anyway.

The picture shows what I meant for the wheel hole. Just a small part is shown I think you will get the idea. The parting board can bridge the hole. It just saves having to fill the hole. If the hole is filled that surface has to be decent to allow a good release.

Ed S

P.S. Keep asking questions. You will save yourself a lot of heartache.