I scrubbed the crap out of it with degreaser. I used scotchbrite pads, a dish type brush and a toothbrush. To remove the degreaser I used a light mixture of dish soap and water. Then I rinsed it lightly(multiple times), and by hand to avoid soaking it. Used my ahop towells to the the majority of the water off. Let it air dry thouroghly and then taped off what needed to be taped off. I didn't not use a primer since mine was already coated in black fairly okay. But, if I could do it again I would just to be safe. As far as painting it goes I follow the can (except for the curing process of course). So far it's holding up well but it takes forever to dry once you lay all those coats, so do something else for a couple days to let it air dry well. They also sell a clear coat of high temp if I'm not mistake if that is the look you want. Hope this helps!