When using HVLP spray equipment , the compressor you choose should be able to contiuously provide 15 to 18 CFM of air. You need to stop looking at hp and tank size when shopping for compressors. Compressors that are capable of these volumes are expensive. Look at the Max CFM's it can produce. HVLP spray equipment require more volume of air at lower pressure. The novice or guy spraying a couple of things a year should look for convensional spray guns that only require 8 to 10 CFM's continuously. So your choice of compressors has broadened and the price is considerably lower.