
After that dried I cleaned the rails again, tested it again (it still rocked) and then added a "racing groove". A little on my philosophy about this. I know that after the cars run for a while they will start to lay down some rubber & it will produce a "racing groove" type of effect. The problem with it IMO, is that it is never where it would actually be on a real race track, rather, it just follows the slots.
What I want to do is to create the impression that this is a real track, and with that in mind, I painted on a groove where it would appear on an actual track. When the cars are zipping around at a scale 400 mph the groove I've painted on just seems to look right & IMO it doesn't look out of place at all, because the cars are moving so fast no one notices that they are not actually following the groove.

Here's how I did it. I put a little flat black acrylic paint in a piece of cardboard, dabbed a bit of water on the rag to sort of thin it down and then, in big "swooping" motions, I rubbed the watered down black paint onto the track & borders. It was almost like a stain in fact.

Before each motion I would sort of think about it a moment & try to imagine what path an actual race car would take at speed. I'm not sure if I got every corner right but I think it came out pretty good. If I got a badly placed "swoop" that didn't look right I dampened the rag w/water & it least lightened it a bit so it would fade into the track. Questions or comments?