One of the things done in the morning before the racing starts is to prep the track. They take torches and heat up the rubber left on the track from the previous day, then they scrape it off. Usually followed by spraying traction compound on the track and rubbing it in with a tractor that has special pads on it. Check out the link and see how it's done. http://www.adgabber.com/video/nhra-full-throttle-campaign
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