After wire brushing my 1ton frame, most of the frame is black with the original paint showing up. Now I know that POR15 is designed to go over rust but I'm wondering if I have enough rust. I will use the product to clean all the oil etc off the frame and the acid prep. before painting the frame. Should I use sand paper and rough up the surface. I've heard of some of you having trouble with the POR15 not adhering on slick or too clean of a surface. I would appreciate responses. Thanks to all in advance------ Funton
