It is not only a case of using poor adhesive, but the foam core that the dash is formed from has the tendency to deform (void) when hot forming shallow depressions under the vinyl covering. This results in inflated or deflated (depending on temperature) areas on the dash. My dash problems started with the vinyl pulling away from the foam core right along the front where the dash meets the windshield....then the defrost brow sprung up one day and would not sit flat in the dash recess...all the while the voiding was going on. All this by 15k mi.
