I suspect the Harley stuff is repackaged VHT ... just 3 times the price. The same stuff was available back in the 70's and today's product doesn't work any better or worse. Back then I used to bake it in the oven at well over the recommended 200 degrees. It stood up to anything you could throw at it. The only way to remove it was to sandblast it - not bead blast ... SANDBLAST !!