I've tried almost all the products listed in this thread. I still keep going back to Surf City Garage's Beyond Black Tire Pro. Best stuff that I've ever used. Looks semi-shiny when it's dry, doesn't sling, and lasts me for anywhere from 2 weeks to a month or so. Even though they recommend spraying it on the tire directly, I prefer to spray it heavily on a rag and wipe the tires down with it. After a bit, I'll go back and buff them a bit.