I don't use an airbrush, so I always use an enamel spray for the base interior color, then use acrylics or cheap craft paints for details. They don't attack the enamel, so there is no running. Also if I make a mistake, then it is easy to wipe off and do over. After I finish, a coat of Dullcote evens out everything and hides streaking. I have some gel pens from Hobby Lobby that work pretty well for details. They also make a white one that works well for whitewall tires. Speaking of coupons, I go to the Hobby Lobby website and get their 40% coupon and save it on my phone to get the discount. Also Michael's stores at least around here honor and match Hobby Lobby coupons.