Another problem with priming the metal is that unless its topcoated within the window, its going to need to be scuffed up.
I have some stuff now that way and I am not looking forward to having to scuff up every knook and cranny.
Ospho I bought some locally, forget what I paid, but have not used it yet. It is alot less expensive than Picklex or the paint mfg's metal treatments and I bet its all pretty much the same stuff.
