146 once the molten adhesive cools and cures the bond is complete the rear rails 58 of the shoe 18 and the rear wheel 34 of the truck 14 are provided as back up in the event the bond is not completed by the front wheel 30 the rear rails 58 of the shoe 18 apply heat which activates the adhesive and the rear wheel 34 applies pressure to the adhesive to complete the bond additionally if the taper machine through which the tape 126 130 is moving is powered down during a run the actuator arm 114 is retracted which permits the spring 98 to lift the truck 14 and shoe 18 off the tape 126 130 this prevents prolonged exposure of high heat to the tape 126 130 and reduces the likelihood that the cover tape 126 will melt warp or otherwise be damaged by such prolonged exposure in the event of such a shut down there may be incomplete bonding in the length of tape 126 130 under the sealing mechanism 10 when the machine is again powered up and the sealing mechanism 10 is pressed down against the tape 126 130 the rear rails 58 of the shoe 18 and the rear wheel 34 complete any such incomplete bonds if the adhesive is activated by.