Testor's makes a sprayer that fits on the top of an air can. It allows you to use any paint. It does take some finesse as heating the can is essential, and don't shake the can as propellant will spurt out with your paint. I've used etching primers (Dupont Vari_prime) and never had any plastic damage, even on bare plastic. I don't regard Rustoleum and Krylon as model safe paints. Too many problems reported here and on other forums, yet many people regard it as their go to spray. As usual, test on spoons AND some plastic from the various kits. There's no way of knowing how much reground plastic is going into models. Good Luck!!