#2100 Airless Undercoating is specially formulated for application on undercarriages of automobiles, trucks and rail cars.  It meets Federal Spec. TTC520B.  #2100 Airless Undercoating dries to a black, firm but resilient non-tacky stippled finish.  It will not crack or peel. It provides excellent corrosion protection, sound deadening, and insulating characteristics.