I've got a spot on my Bonneville inside the rear door by the rocker about the size of a dime that is to bare metal. What is a good spray bomb to use before I paint? I don't want to go out and get POR 15 or Rust Encapsulator for this small spot, so I'm wondering if Rustoleum or some other product will give good long term protection. Otherwise I'll just hope I can sand it well enough and use some primer.

i have a couple small spots that sound similar to this. mine are not in very noticable areas so i was just planning on sanding it smooth, primer and color match paint. any better suggestions would be great!

Yeah, I've done the same before, but it usually seems to rust again. But then they were spots that were on the exterior open to the elements. I may just get some Rust Encapsulator, but I'm looking first to see if there is something OTC that will work just as well for such a small spot.