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washed my tires thoroughly especially the tire shoulders and the difference in hard cornering was simply amazing...best part about it was predictability of the handling. with tire shine, it still grips well in soft-medium cornering but when u're on the edge u dont know when u'll lose it. i guess i wont be using tire shine anymore or at least the cheap ones. my assumption is that silicone are highly migratory (like oil) especially on permeable substance like rubber therefore even if u apply on the side walls, they tend to migrate to the shoulders and affect your handling. just speakin from my own experience, u guys can try it out and confirm this. for those going to the track this should definitely be in your to-do list...
