Dow Corning Molykote 55 O-Ring Grease Lubricant, 57 g or 2 oz GENUINE DOW CORNING MOLYKOTE 55 O-Ring Grease, NLGI #2 Consistency, Off-White Color. Molykote 55 O-Ring Grease has been shown to swell natural rubber. It is recommended for dynamic lubrication between rubber and metal parts in pneumatic systems in aircraft, automotive and general industrial applications. Also used in certain paintball marker applications.