Now there is a better way. Mossy Oak Graphics sells a kit containing a version of its vinyl truck cladding cut for covering one pump or semiauto shotgun. It's waterproof and, if you follow the instructions, it's safe to leave on your gun for as long as you want without fear of rust. You trim the pre-cut pieces to shape, then fix them on with a hairdryer, which shrinks the material on for a tight fit. The gun doesn't quite look dipped but you can make out the checkering pattern beneath the cladding. It looks good.