Have an xj so the sun isnt an issue but the muffler heat was. I modded up a heat shield with sone duct sheet metal suspended between the muffler and tub and it was 100% improvement.
I used rustoleum satin finish on my aluminum wheels. I cleaned em with simple green and sprayed, thats it. They are banged up from wheeling but i wasnt worried about getting them perfect. The point is, theaint has held up well.