RE: Krylon Fusion attracts dust... I think it may be because of the texture on the cladding, it has since been rained on, looks better, but still not as shiny as the Forever Black. Interesting that it could take the engine heat! I'll keep that in mind for mine.
RE: Forever Black is somewhat permanent as it still chips from road trash or possibly from NOT getting prepped properly! I may have gotten sloppy when I got to the one side that has shown most of the wear.... either way it is still my favorite.
RE:303... good, but still temporary and a different look, much like Armourall in my opinion. I use it over other things.