To create a false hairdo
Cars (logo only)
Cars 3 (logo only)
Vinyl Toupee is a mark of vinyl spray cans that cars can use to have a nice vinyl toupee on the roof. Crusty Rotor is the bearer of this sponsor and also a client of it, as he uses it even for racing.
In Cars 3, Crusty has since either retired or been replaced by a next-generation racer.