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It looks like silicone contaminant to me.

Years ago I worked in a shop where a very small amount of silicone was sprayed
50 feet or so from the spray booth that was upstairs. We never did that again.

Thanks folks, I appreciate your help!

It is definitely not a compatibility issue with the epoxy or bad equipment/settings/technique, since both the neck and the top came out perfectly.

My intention was to leave a thin film of epoxy and spray the nitro directly on top of that. I know I sanded through on a lot of places though, but I didn't think it would matter. I am almost certain that the finish came out uneven at the areas where I sanded through.

Anyway, assuming that the problem is that the nitro doesn't adhere directly to the EIRW, I will probably strip the back/sides completely and do it over (I would like to hear it if there is another option though...). If I end up stripping it, how do you suggest I prep the body before starting to spray nitro?

Thanks!
Sondre

Nitro has no problem adhering to curing on EIRW. It's polymerizing finishes that need a barrier coat on oily woods. (Nitro's not polymerizing, it's evaporative) I didn't think about water/oil contamination in the air line until Brian mentioned it. It wouldn't take much to contaminate the back. Did you spray the back last? That could explain why there's no problem anywhere else. It could also be silicone contamination of the wood from a long time ago.

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