On the proof of concept oval, I just used flat latex in the slot. This worked fine, and made it easy to judge if any wear was happening, but the roughness of it that is good for tire grip isn’t good for low resistance on the guidepin or flag. If you just pushed the car around the track with your finger you could feel the drag that just isn’t there in a plastic track.
So, I devised the following solution.
- go ahead and paint the slot and road area grey.
This is necessary to blend the slot in with the road color.
2) Coat the slot and area where the car will run with Smooth-On Epsilon Pro Epoxy.
Repaint just the area where tires will touch, not down in the slot.
Now you have high hardness and some strength only exactly where you need it. And you have traction where you need it.