Reply to "building lionel postwar dealer display- What grass mat do I buy?"

I'll second the posts calling for painted sawdust or an old-fashioned "grass" product rather than a mat.  Easier to put exactly where you want, won't buckle, easy to repair if there's a mishap, and easy to scrape off and re-do if you want to change things around.

And the newer scenery products don't provide the period look of a dealer display.