only metal ive painted was an offshore drilling rig.
2 part International or Carboline brand paint.
used a siphone (wash down) gun.
where i work now they use a PPG brand paint. not sure if its 1 part or 2 part.
We use international epoxy paint to paint the spill gates at the dam. That stuff is incredible. I have no idea what cost and availability is though. For ease of touch up, I do exactly as hot rod said. Pay attention to the quantities as they can affect gloss a bit.....if trying to match colors.
