I personally think the rubber is faulty or I purchase the wrong glue. I tried to get the company to replace them but the receipt was out of their return date regardless of use.
The shoe cream arrived in a timely fashion and does what I expected. Easy to apply.
Much difficulty matching colors offered to the leather seat color in car. Had to order 3 cans of different colors but as close as possible to what your color chart showed....then re-ordered 2 more. Hope it blends in.