Like many others, I use 1/8" Masonite for a fascia. On some layouts I have painted it black or brown. This time I left it the natural color that it comes in. It blends nicely with the earth tones of the layout and I may just leave it as-is. I use Velcro for various tethered devices and it seems to stick nicely to the bare Masonite.
John Timm