You will be fine with the air compressor, but I hope that you will not be putting 150 psi on your hvlp gun, when painting a car you want to use only about 30-40 psi, I believe if you turn it up to 150 psi, it will probably damage youre gun, I just purchased a hvlp gun from sears with a 33 gallon, 150 psi, 6hp compressor, and I can run the gun without it having to pull more air for a long time.