Review on 🔫 Efficient Coating with Astro 4538 Economy Air Undercoat Gun by Doug Hinrichsen

Used to spray the underside of my car trailer with 3M 08864 Body Protection Rubberized Coating Black. The key to spraying this substance is a very good mix. The first time I didn't, it jammed the gun. I also thinned it by topping up the bottles with lacquer thinner, although I don't think it was needed for the gun. Even diluted, I couldn't get it to spray out of this gun with the 3M primer hose attached. He went about 1/2 up the pipe and then pounded it.