For tire, if there is crack.. I don't know how to fix. If there is not crack, ...
Never use tire treatment for real car on your rc rubber tires. It will damage your tires in long run because of the petroleum content of the product. Use pure silicon oil or glycerin(甘油) instead.
I'm thining some of my collections, now I have one New in box PB Mini Mustang 2WD for sale , and I have enough spare parts to make it to 4WD !
Please let me know !