what kind of gun/painting system are you using? because the air requirements for the average HVLP shooter is much higher than what average hobbyist compressors can put out, i.e. 6-8 cfm @ 90 psi required vs. 4 cfm @ 90 psi (likely performance). To get that much flow at 90psi you're likely looking at larger 220v/1P motors.

LVLP will work, but will put out less paint and likely take much longer to spray an entire car. 4 cfm @ 90 psi should be good enough for LVLP.