Always used Krylon, Rust oleum, and store brand, depending on what I was painting. Though recently, Kilz has come out w/a spray can line, and they spray really great! I had problems w/Rust oleum's rusty metal primer clogging the nozzle, I don't know if they've gotten better on that. I also use Klean Strip's spray rust converter, great for those rusty parts! Dupli color has a nice metal etching primer. They have it at Advance auto, and also their line of filler primers. ~Adam