Has anyone tried or heard (1st hand) of anyone using X I M primer on Wave Hulls?

I stopped to talk to some painters that were painting roto molded decorations, to see how they got the paint to stick. They were using X I M Primer for plastics. According to the painters, this stuff is more of a glue than a paint. You rough up the surface and the primer fills the scratches leaving a smooth surface for painting.