I had a few ideas of materials, but havent had te time or space to try them yet. Have you guys had any luck with these.
Truck bed liner paint.
It seems to have a nice texture, but i'm not sure about whether the traction is low enough. Its nice to not have to aggressively bank corners, not have the car flip over and of my desk
plexiglas
if cleaned with rubbing alcohol every week or so (to keep our natural pils off the track as well as dust) I'd think plexiglas would make a neat material. Even cooler would be a multi-level figure 8, so you could see the guys racing under you as well
I might try the plexiglas if I can find the time and space, apartments are not a good place to take powertools into, trust me on this. Madness from the neighbors is a bad way to end the day.
laters!