We use fish tires only (no glue) on my home Gerding track, and traction can be an issue. I've found a solution that works very well: Blue Juice Trumpet Valve Oil! Just spread a little on the tires, rub it in, and in less than a lap you've got solid grip that lasts 200+ laps. It doesn't leave any noticeable residue, it appears to just soften the tires and the rubber already on the track. Lap times went from 4.2 down to 3.7, much better handling and no tendency to "trip." Not sure what it will do to tire wear, but it sure makes for nice handling!
When I was a kid, I played trumpet... well I played it as an adult also, but I used valve oil all the time! It's a very highly refined oil with very little impurities that cleaned and softened the tires beautifully. I don't know how tire rubber has changed since the 1960s, so things are probably different now, but I got a nice reminder of days gone by seeing this posted.
