Most True Hvlp Guns Only Need 10psi Max At The Cap Thats Why I Use On My Sata Nr2000 Which Is What I Use For Base.... Hvlps Do Not Spray Clear Real Well Just To Help You Out Plus Ure Not Looking At The Psi The Compressor Is Set At Rather Then How Much Max Cfm Ure Compressor Can Put Out @40psi To How Much Cfm Your Gun Requires