Video from Gunfire showing how to apply the Camo-Pen on you airsoft gun... "If you want to remain unnoticed on the airsoft battlefield, good masking is essential. Camo Pen paints offer you a very simple, fast and clean application of an effective camouflage on a replica and more! Camo Pen paints are equipped with a convenient applicator with a sponge, they are suitable for coating plastics, ceramics, metals, and textile materials."