The metal will absorb moisture and that will keep paint from sticking to it. If you use a primer/sealer it will help. heating the metal until it stops weeping is the best way but that is hard to do with something as large as the rear end. You can do it with a propane weed burner but be careful you don't need to get it very hot - just warm it until the moisture stops coming to the surface. Yep! I are crazy. i do that to my engine blocks and transmissions too.
Paul
I have a high speed fan that I use for blowing stuff dry after the soap down wash. I just use Krylon rust tough primer and paint for this sort of thing. 2 to 3 medium coats of krylon rust tough gloss black make it fairly durable and it looks nice for a long time.
I use Rust tough Krylon or some other such rattle can and they ALWAYS turn out nice... I usually torch my metal to get the moisture out like said above here but on a rear end it's usually not necessary....
Sounds good to me too, I will paint it this weekend. Thanks for the great info Gentlemen! This forum gives me peace of mind that I'm doing it the right way, thanks agian.