I sprayed alot of Testors Model Master and the old square bottle stuff, Thinning 60 Paint/40 Thinner seems a bit much try 70/30 or even 75/25 at 15-20 psi to start, test diffrent mixes and pressures until you like the results. Use Lacquer Thinner for cleaning and use Testors Airbrush thinner for thinning only, also open the drain on the compresser and let out the moisture regularly, adding a moisture trap helps, you can pick them up at any Auto Paint store. Water dropplets will ruin you paint job in a heart beat.