supplied via supply line 22 to the heat exchanger and then to the applicator hose assembly 24 through line 25 downstream from the hose assembly a quick fit connector 92 and valve 90 are provided to selectively permit application of heated waterproofing composition through the hose and applicator nozzle 32 or alternatively the waterproofing composition can be recirculated to the reservoir via connection to the return line 28 as permitted by the valve 90 recirculation of the waterproofing composition through the reservoir allows for a pre heating of the hose 24 or other applicator in practice this has provided advantage since deposits may form in the hose which would otherwise impede even uniform application of the composition to the desired substrate accordingly the operator preferably utilizes this recirculation feature to allow for proper pre heating of the hose before applying the material to the desired substrate as shown the apparatus comprises a direct heating system upstream from the heat exchanger 20 that provides for in reservoir heating by the heat exchange fluid from the motor vehicle this has proven effective in softening and fluidizing the gel like agglomerates that can form in the bottom of the reservoir here in this direct heating pass heat exchange medium is forwarded to the tank 8 through three way valve 27 and supply inlet conduit 19 conduit 19 communicates with serpentine heat exchange coils 45 disposed along the bottom of the reservoir heat exchange fluid returns to the conduit 11 through return conduit 21 which communicates with supply line 11 downstream from valve 27 as shown at u201c t u201d fitting 75 an auxiliary valved inlet 117 is provided in conjunction with the reservoir.