Ripped from the internet;-
Contact cement is a powerful adhesive made of neoprene and synthetic rubber. It is highly resistant to moisture, bonds almost instantly, and requires no clamping of the bonded materials. This adhesive can be susceptible to deterioration, however, and it is not as effective when a powerful bond is required for a long period of time. It works best used with plastic, rubber, glass, leather, metal and veneer.