After many years of experience and many months of testing we have simplified the foam tire prep game with our two unique formulas. We offer a Red Prep and a Black Prep. We recommend starting off on the black prep because it will make the car least aggressive on most track surfaces. The Black Prep works really well on wet tacky tracks or tracks that have a black groove. This will make the car feel the most stable. The Red Prep will be more aggressive and we have found it will increase upfront lap times. It will have more overall grip but the car will be less stable in most cases, due to the aggressive feel. After several months of testing our Bearing Oil, we have found zero failure rate. Make sure you add this to you weekly maintenance program for all your bearings. (It even works on squeaky chair shocks!)