THE FACTORY UNDERCOATING WAS PUT SO HEAVY AND SLOPPY THAT WHEN THE ENGINE EXHAUST SYSTEM HEATS UP THE UNDERCOATING DRIPS ON THE EXHAUST MANIFOLD AND EXHAUST PIPE "FLASHING" CAUSING HAZARDOUS FUMES TO ENTER THE CAB OF THE VEHICLE THRU THE AIR CONDITION DUCTS. I REQUESTED A "MATERIAL SAFETY DATA SHEET" FOR THE APPLIED UNDERCOATING FROM THE DEALERSHIP BUT HAVEN'T RECEIVED ANYTHING TO DATE. THE FUMES ENTERING THE TRUCK ARE SUSPECTED CARCINOGENS AND COULD HAVE LONG TERM AFFECTS.