HVLP Spray Guns

If I remember correctly the clear should be shot after the base has some cure time.
Like the next day.
I do remember shooting base in the morning and having a car or truck in the booth with lights for hours and then shooting the clear in the late afternoon, but there was hours of heat aided cure time between.
Auto paint with hardeners are quite a bit different than spray paint, so one coat doesn't eat or wrinkle previous one's.
The base/clear relies on certain specifications (based on,controlled paint booth conditions) as per Product data sheet. There usually is a window of time ,to spray clear over the base. (For instance Napa Tec Base recommendations :Base should be cleared within 24 hours...) I have cheated that,within a shop.,To be honest, it's about the prep and patience, and covering the elements. BACK TO THE O.P. :
TCP Global ,works just fine..slightly better than Harbor Freight. I used H.F. 92126 for my jambs , lays down small sweet ,and easy . (Keep it clean,it's almost an airbrush ) Speedthrills...If you do a H.V.L.P....Treat it ,as you would learning to spray an,old school siphon gun .Find something useless,spray away. And learn . What's your air supply?