I have turned to this now for all of my traction needs....
https://www.amazon.com/dp/B008...t_dp_U_Wv.XEbKYFW898
I spray some in a cup, run the loco upside down at low speed and apply 3 coats of this with a micro brush such as these...
https://www.amazon.com/dp/B07F...t_dp_U_aB.XEbDW7ZM6H
It is similar to the instructions for applying Bullfrog Snot, but I highly recommend mini brushes instead of a toothpick. And regarding Bullfrog Snot, I find Liquid Tape to far outperform it in both traction and endurance.