Additive for foam rubber tires. For noticeably better traction and grip.
Own experiences and application recommendations.
Mount tires on a special lubricator for 1/8 or 1/10 foam rubber tires. Lubricate the rear wheels completely and 50% of the front wheels. The outside remains free!
Let the tires run against each other for 30-45 minutes. Then wipe off the excess lubricant with a cloth, otherwise there is a risk of slipping in the first few meters ;)
For even better results, wrap the tires in cling film and let them rest for 24 hours. Then unpack and drive off!