Paint doesn't stick

I've been trying to paint my printed minis and no matter what I do paint is always fairly easy to get off. I have tried several different resins, cleaned extremely well. Single layers of primer, multiple layers of primer no matter what when I get to painting the primer doesn't hold up. It does a decent job but there are always spots that rub right off when they are rewetted with paint. Suggestions? I'm using monument paints pro acryl. I'm also using their primer airbrushed on.