do you use the W-400, or LPH- 400, the paint suplier for our shop said i could try one out for a coupla days and i was gonna spray a coupla test pannels this weekend, but which one do i use for what, they dont know alot about themrab2039 said:We're an all iwata shop. Love the guns but it's an acquired taste. You have to pick the right setting, i.e. rate of spray, etc. but once you get comfortable with it, you don't want to use anything else.