Using your index finger to press and steer a can of spray paint gets old very quickly. If your paint job lasts more than a few minutes, you really should use a snap-on pistol grip. It saves your knuckle, keeps paint off your trigger finger, and gives you an easy way to guide the spray. For years I've used an earlier model of this grip (called simply Can-Gun), but that one was only operated with a single finger trigger. This new version uses your whole palm. It's comfortable, quick-on and off, and the only way to spray. I had a 5-can job on a chain-link fence and the Can-Gun made it kind of fun. Even for small spray paint jobs, I slip one of these on.