Hello,

I have a mould made out of wood and i want to create some skins from it. What i did so far: I have dyed the mould with primer(2 layers). And now im thinking to add a layer of painting. Is this necessary? If I leave it with 2 layers of primer will my mould react with my epoxy resin? I am going to do infusion process. 

Products may vary, but there's always a risk of the epoxy sticking to the primer surface and pulling it off onto the new part, leaving you with a lot of finishing work

Always best to find a good topcoat that can provide you with a reliable surface that will offer a good prospect of release

An automotive quality paint finish will work, although newly-sprayed finises can be a risk if not sufficiently hardened.

If available where you are, then EC's pattern coat high gloss will provide a good surface that's relatively easy to flat and polish. Alternatively, an epoxy coating resin, although this will be a little bit tougher to flat and finish afterwards.

I've used tygavax tygaflor and tooltec for use on mdf and wooden plugs, it's a self adhesive ptfe tape and works well, but it ain't cheap.
As you are aware the wood soaks up anything you put on it, I know people have used wax through to 2k lacquer. The key is to make sure the coating is cured fully and compatible with the resin system you are using