I only needed 6 of these for what I needed to do. Three went on painted surfaces, three went on plastic / vinyl surfaces. All the surfaces were vertical (like a wall) and all were cleaned with appropriate cleaners or solvents, flushed with clear water, and dried with a hair dryer attempting to make then as clean as reasonably possible and moisture free. The next day I started seeing them on the floor instead of the walls, and by the second day all were off. Some actually left their double stick tape on the wall (tape stuck to my wall better than to the bumpers? Wow!)I was able to glue them up using some PlioBond contact adhesive, and they have the needed cushioning effect so for the price they are not terrible. I suspect that the maker is not to choosey on his double stick tape source, as this stuff did not seem to want to stay on the bumpers at all. They need to have an adhesive more like what is on Flex Seal tape.
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