Hey guys I've been having this serious issue with a prop recently and it's driving me banana's! I bought a cortical stimulator off ebay, didn't cost much and i thought it would look good in side a med kit i'm trying to build. The prop is made from this milky white material, which i'm guessing it's a form of resin. I've sanded it down, smoothed it and prepared it for the primer coat. It goes on perfect except for in one spot. Two tiny little spots side by side where it will not dry. What is going on? I'm gussing some sort of reaction. I'd appreciate and help that could be given. At present the only option i see, it using a light layer of filler to cover the spot up.