In Italy the additive (sauce) is legal now and have initiated many experiments. The simplest method is to use the additive an hour before the run, put the tires in the sun and then run. In doing so, however, the additive does not penetrate much. So in addition to the battery status (go down the times of 2-3 tenths of a second a lap with a 1:10 and maybe more with 1:8) I do not see much utility. In fact, in the final race for 30-45 min , the times are more up.
The method of preparing the tires the first day is more efficient but also more laborious.
was the best thing legalize the additive, but was a big waste of time even.