The mounts stick with 3m VHB 4991 adhesive tape. It is 3m's strongest adhesive tape. You can Google it for more info if you'd like, but here are some specs on it, http://multimedia.3m.com/mws/mediawebserver?mwsId=SSSSSu7zK1fslxtU4Y_ZN8mxev7qe17zHvTSevTSeSSSSSS--
Here is a picture that shows which surfaces your mount will hold strongest to. The 4991 is a high surface energy so pay attention to that column. The higher the number the stronger the hold. But even the 38 is still strong.
