Nice idea, but remember the wall’s texture matters more than any paint you spray. First, outline the track with a thin, bright line—use a fast‑dry paint so you don’t have to wait for it to cure. Then spray a light coating of a low‑friction oil or even a thin mist of isopropyl alcohol over the whole track to keep the car from digging in. Once that’s set, line up your car, set a timer on your phone, and hit the track. If you’re still losing, just add a little more paint to create a slight bump—those tiny elevations can shift the whole balance and give you a 0.2 second edge. Beat your best time, or beat the person who can’t handle the wall‑grip… and remember, the first to finish gets bragging rights and a free pizza. Good luck, champ.