Couple questions.
When you say your paint is still wet, is it just in the primered stage? or did you already paint all the other layers? In other words, is it just the paint that isn't dry? Or is it the primer too?
Did you wash the helmet thoroughly before priming? it could be that some mold release was missed and that is causing the paint not to dry.
Absolute worst case. the resin is weeping because it wasn't mixed thoroughly enough before pouring, or a contaminate got into the mix. I've heard you can cure this issue by heating it, but you have to worry about warping. What I have done on weeping resins, is coated them in some baby powder for a few days, and that has drawn out all the oil the resin generated.