I used some krylon ultra flat "camo tan" on my shotgun's furniture. I didn't need it to be pretty and if it starts to flake after a while I'll just throw another coat on. No big deal and it cost less than $5 for a mostly functional paint job.

Just do really light coats and let one completely dry before you apply another one. Don't rush it. Same logic for using all spraypaint outside of underpasses and walls downtown.