This is a Fleer (now American Heritage) 41 Ford that I added body rust with artists crayons. Next I coated it with a finish to give the look of tired but not ready for the junk yard . Don’t coat the glass with flat unless you want the look of very dirty windows. A light coating may work if you mask off the windshield wiper sweep area.
Let’s see your weathered Motor vehicles and share your technique.
A link to O Scale Motor Vehicle Chronicle XXI
https://ogrforum.com/t...nicle-vol-xx-june-28