I've been using WD40 on my tires for a few months now. I've tried it at a couple of tracks and I've noticed it works pretty well most of the time. You really have to let it dry thoroughly. I think it also helps to really work it into the tire with a brush. When I am using slicks I like to use a towel and rub the tire in a spot I've sprayed. My usual process is to apply WD40 on a toothbrush (your moms!) and then put the tires in a ziplock or other sealed bag overnight before I'm headed to the track. Then I will use sticky kicks at the track because it dries much faster.