06-02-2009, 01:22 PM
find an airbrush and water down some black acrylic paint (alot like 4 parts water, one part acrylic). Then spray the concrete area unevenly. You can add more on some areas than others - maybe highlight small spots where oil has been spilt - lines along the edges of where the rails meet the concrete (If you have steam engines running on the layout).
Tom (TC) - Creator of Extremely Miniature Layouts on Disks! See Them All, and More on My Website. Latest Update: Jan '10.