Transfer Resto Ricks undercoating to the smaller gun reservoir. I then drill out the gun nozzle to a larger diameter. Then to get the build up like the factory I shoot a heavy coat and then let it dry over night or so then come back and do it again. If you keep building it up on the first pass it will flow out as it cures and you won't get the build up. Also a minimum of 4 beers are needed to get into the factory worker's state of mind.