I have had really good luck with the Eastwood rattle cans for durability and color options...

If you want to use "gun" paint, go buy a couple of gravity feed guns from Harbor Freight..

The small ( regular style, not the "finger" kind) can be had cheap ( Under $10 with coupon) and does a great job for primer/paint on smaller items... The gravity guns are really easy to clean ( I just spray some lacquer thinner through them) When it wears out just throw it away.. Had really good luck with them....