I have an Apollo sprayer that I like very much. I use it to spray water based varnish on the cubbies that I build for the YMCA's. Stuff cost about $50/ gallon. Cut my usage by more than 50%. Paid for itself on first job. I bought my gun from Gus Stefurac (spelling?). He has reprensented Apollo for many years, and may be retired now. Built my own turbine using Ametek vacumm motor from Grainger. This is the same turbine that Apollo, Fuji, and others use.