Advice to eliminate pinholes

i am having trouble with pinholes in my paint. The primer looks great, very smooth. I wipe down the model with rubbing alcohol, blow off the part with air, then spray the topcoat. Same thing happens with my airbrush and a rattle can. Sometimes more than others. Last time i used tamiya paint in an airbrush, tonight i had a testors rattle can. Same primer both times - citadel chaos black. I figure it has to be my prep. I cant get it to show in a picture. Maybe tomorrow i can try some different lighting if an answer isn't obvious to you guys with lots of experience.