Originally Posted by ibuild
Manks7477, you have gotten past the first barrier that is actually to do the work, the next time you already know what to do and it makes it alot easier. I wish you did use the PVA the first time, it would perhaps still not part perfectly but we would have a better reference to give you advice. I know it might take the air out of the balloon if people say like you should have done this and not that and so on because obviously we all know the effort involved, also I know you would want to manage and get started with what you already have on your shelf rather than buy a lot of other stuff that costs money and perhaps takes time to get hold of.
The advice Scott is giving you about getting some 2 part epoxy primer is a good one. I get it from the car/auto shop and it is not particularly cheap, but it is something else than the epoxy used on the plug and mold and it makes a secure base for the wax as the finish coat on your plug. You have done just the right thing starting with a reasonable simple shaped cowling, some people goes through all that with something like a complete fuselage and the effort as well as disappointment could take the breath away from anyone. Just look at the pictures from Speedracerntrixie, this is what you will be capable of doing.
I do appreciate the help! Overall I am very happy with the results, the mold is in good shape, not perfect but pretty close, any defects can be fixed with some more sanding and maybe filling with a bit of epoxy and filler. I will prime the mold as per the comments and then put in many, many layers of wax, then PVA. Even if the parts pulled from the mold are not usable, this was a really good learning experience.
I have a second plug that is almost ready to go, this one again is simple, only going to pull one part from it, but it is more good learning. By the time I do my third plug I think I will have the process pretty much down.
I may try to do the hull of a boat before trying a fuse - just seems like it would be a bit easier to do. I am actually finding the process to be very satisfying. I thought I would go crazy making things perfect, but it is oddly enjoyable.