Hot Asphalt is the type of asphalt that you mostly see when driving past a construction crew. Use mostly for paving and patching, Hot Asphalt, as its name suggest, is easiest to work with when the temperature of the asphalt is high. Hot Asphalt is a permanent solution to a problem, but must be used almost immediately after purchasing. As the asphalt cools, it becomes increasingly difficult to work with, and once completely cool, it hardens like a rock. http://www.czyuzhan.com/asphalt-equipment/asphalt-concrete-instrument/