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PJ1 TrackBite, formerly known as VHT TrackBite or simply VHT, is a custom formulated resin, typically black in color, used in drag racing to either increase the traction of a car's tires or as a sealer for newly ground and/or resurfaced race tracks. It stays sticky for weeks, has fire-retardant properties and is hydrophobic. It is generally sprayed onto the track from either a 55-gallon (208-liter) drum or 1 gallon, 2.5 liter and 15 liter plastic jug. It has been used in professional racing since 1972. With the help of Trackbite, a normal street surface can be prepped so well a drag car can lift the front wheels off the ground.
It can also be sprayed from specialized VHT spraying tanks. The TrackBite that the NHRA uses, commercial "VHT TRACKBITE CONCENTRATE" is yellowish in color and per NHRA regulations is diluted with methanol for optimum effect. Trackbite contains no petroleum distillates and is biodegradable when dry.
Its use was prohibited by NASCAR in 2010 to reduce the amount of chemicals used at its events.
The compound originated as a high temperature coating made for NASA by the Sperex Corporation. VHT, a brand owned by Sperex, began offering it for sale commercially. It was taken up by drag racers, and Sperex soon began producing formulations specially made for the sport. Sperex was purchased in 1989 by businessman P. J. Harvey and is now part of PJH Brands.