FB-3 Modified Wearing Course, or Flexible Base, is a multi-purpose, ambient temperature asphalt for use on existing streets and roadways. This proprietary material can be used as either a binder or wearing course and requires no chip seal to seal the surface. This material will perform well on roads with below standard and weak base courses. The material remains very elastic and pliable at temperatures ranging from 32 degrees Fahrenheit to 100 degrees Fahrenheit, and yields a durable, long lasting surface.