I really dont know what you guys and gals use to lube up your o-rings but i have a lot of this stuff from my rc days when i looked forward to racing at Debbies RC World.......it is Silicone shock oil and for me it does the job. I can change the viscosity of the oil by going to a heavier weight by the number or go lower if need be. This is a good way to keep a good supply of silicone oil around and know that you will always have an ample supply. Check around for pricing at your local hobby shop. A drop or two will keep your o-rings in good shape and calm that awful noise when you put the bezel or tail cap on. And yes i have tried Silicone Grease but it just never lasts long, especially if the light got hot the grease would just be everywhere because the heat of the torch would cause it to thin out. As of right now i am looking for those little bottles (the eye drop kind) that you can refill so i can share this stuff with others that either dont know where to get it, or using not so quality oil or grease.
Here's a good place to get this stuff.......they sell 2oz bottles, your wallet and torch will thank you for it.
I use bisely silicone gun oil, deoxit and a special ptfe grease on my lights. Got some nextorch silicone grease in the mail, but have not tried it yet.
I use die-electric grease, the same stuff used used to seal out crud from car headlight plugs. Good for lubing the threads too. A cheaper die-electric grease might be the stuff used to aid the conduction in aluminum house wiring at the main panel....used between the aluminum wire and the copper bus bars.
Use normal multigrade engine oil in it. Works for me.
If it doesn't, I use silicone grease or Copaslip (http://www.molyslip.co.uk/anti_sieze_compounds/) if the threads are really nasty and if I can find the tube. Which I bought in 1981. A little of the stuff goes a very long way.
Thanks buddy, now that is something that i need.......i noticed that with the Silicone Grease that when the light would warm up and get hot that the grease would just flow everywhere.......needed something better so i started using my rc shock oil for it and works so much better.
I either use machine oil or honing oil on my threads and orings. I don't like using grease because it gets everywhere whenever I change batteries...lol Guess I'm a bit messy.
I either use silicone lube from little tubes that came with camera equipment or dive equipment. You can also get a little dish of silicone grease at any dive store that will last you forever. It's the size of an Oreo Cookie.
Please avoid using petroleum-based lubes on your O-rings, as it will cause them to degrade.
This means no machine oil, motor oil, or rear end lube (lol.)
While most dielectric greases are silicone-based, I would avoid their use as well. Any transfer of DG from the threads to the unanodized portion of the body can affect light output.