One of the gravity feed touch up guns from Lowes, Wal Mart, etc., would be a good first choice. Your compressor will run it, it will just cycle more often than a "big" compressor, as you know.
The gravity feed guns will use all the dope you put in the cup, whereas the siphon feed guns will always leave a small amount in the cup. No biggie, just less hassle.
Bill <><