No thinning, straight out of the bottle, reasonably close....around 10cm/4" , keep the airbrush moving back and forward to avoid a pooling effect...around 20-30psi /150-200kpa
for me it's pretty much an automatic procedure, I don't think about it.. works well for me...sometimes I get a bit of 'frosting' in areas along the wingroot fuselage but I let it be as it comes straight off with a damp cotton bud rubbed lightly over the Gloss once dry....