In da Tuna's B19 guide he refers to 100% pure sulicone grease such as Permatex 100%tune up grease or Versachem 100% pure.... Also, in the Library he refers to going to the auto parts store and asking for the silicone grease for spark plug boots. I have seen this in small envelopes for the terminals of car batteries at Autozone. But I have 100% silicone "Plumbers Grease" for valves, washers etc. on hand and am anxious to open the G1. Thinking of getting a guide set from Paul. I alsobought crosman springs and piston seals that I may install first while waiting for the "Fix" kit.