I just hope it helps with grop and hasn't just turned into an art session. Lol.
With the sugar soap I just spray some onto a cloth and wipe the track. I use another dry cloth to wipe it dry and I left the track pieces (I got half of the track rails cleaned and polished and the plastic degreased last night.I like the dark shade better but I would use the lighter one for the pitlane.
Do you use something else to remove any residue of sugar soap from the track?
It's worth noting for readers checking this thread for help on painting Scalextric track that you are showing Carrera track. This matters because it's a different kind of plastic, and some things that work well on one will not work as well on the other. Generally, rattle-can anything doesn't bond well to Scalextric track or borders, at least not without some kind of other product in between to do the actual bonding. Besides, rattle cans are way messier than rolling on some wall paint.I used a rattle can product called Rustoleum (here in the USA) - Aged Iron is the color. It's a Textured paint and provides excellent grip, and looks exactly like normal road surface.