HARD TRACK IS BEST USED DURING THE SUMMER MONTHS WHEN AIR TEMPS GET ABOVE 80 DEGREES. THIS IS YOUR ULTIMATE DAY PRE RACE WIPE. AND ITS ONLY INTENDED TO BE USE TRACKSIDE. ONLY USE HARD TRACK WHEN THE RACE TRACK. GRIPS UP AND ON TIRES THAT JUST NEED TO BE FIRED OFF. MEDIUM MAY BE A BETTER PRE RACE WIPE DURING SPRING AND FALL MONTHS WHEN AIR TEMPS ARE BELOW 80 OR NIGHTTIME. AVERAGE DROP IS 3 POINTS. WHEN USED HEAVILY IT WILL DROP A TIRE UP TO 5 PTS ALWAYS CHECK THER DURO AT ROOM TEMP.