I just went through this with my Power Wagon. The whole top was baked right off but it worth it to buy a desert truck. I DA'd with 80 until it was shiny metal. Then treated with OSPHO and let it sit for a week, cleaned it all off with more OSPHO and steel wool wet and wiped dry. I DA'd one more time with 80 and two coats of SPI epoxy. It came out well. It may look like shiny steel but there will be pits that need to be treated.