They are also sometimes sold by 'miscellaneous' vendors like Crazy Wolfgang, Knick Knack, Karl, and Seagrave Holmes.
They are reliably found in toolboxes, metal boxes, around workbenches, and in raider camps. Paint guns are found throughout the Capital Wasteland. In Fallout: New Vegas it serves only as a miscellaneous item with no known uses. In Fallout 3 they are used in the construction of the dart gun or used as Rock-It Launcher ammunition. Paint guns are a common, semi-valuable junk item.
The paint gun is a miscellaneous item in Fallout 3.