My DH uses RTV Silicone that you purchase in the automotive department in Wal Mart. Be sure to clean the area with rubbing alcohol. Place a piece of saran wrap on the back and turn it over and press slightly. It will flatten it out slightly. When you start out with a drop about the size of a pea, it spreads out to the size of a nickel. It is blue but transparent.
Last edited by twinkie; 05-08-2013 at 02:48 AM.