UPDATE: Floquil Paint Markers are now marketed as Testors CreateFX Paint Markers. Same stuff.
(For best viewing, watch in 720 HD) How to add realistic weathering to model railroad track. No airbrush or paint brush needed! FYI Rustoleum paint will melt styrofoam like Woodland Scenics risers. I have used it in the past with very minimal effect on the foam board. If you use cork roadbed and don’t spray like a mad man…you will be just fine on foam insulation board.