Before you do anything drastic like trying to remove the paint chemically or with sandpaper, get some of the Dulcote in a bottle and some lacquer thinner. Mix up the Dulcote with 25% thinner and practice with your airbrush on some old models from your junkbox. After you feel like you've got airbrushing down, spray your caboose with very light coats letting them dry for about 10 minutes between coats. Don't overdo it don't let the surface get very wet. It just may get rid of the mottled appearance. I've done this before and have had some success. However it was years ago before when I decided rattle cans were hopeless if you wanted a good finish.
Ken
