Camouflaging Your Gun
Painting your rifle is an easy DIY project that makes for a great off-season activity. Spray painting a gun is virtually impossible to foul up for the simple reason that there’s no such thing as a right or wrong way to camo a gun. From the article "DIY: Camouflaging Your Gun."
When I spray through a net overlay, I make sure to vary the direction—diagonal one way, then another, then vertical—to vary the pattern. The goal in camo painting is to make everything non-linear and non-symmetrical.