Nitecore says it's "suitable for all flashlights" Some pictures actually show it being applied to orings. The description at Goinggear reads, " Lubricating silicon grease for extending the life of electrical contacts and lubricating surfaces that are conductive." If it's really just silicon grease, it should be fine. I used plain, silicon grease for a long time before Nyogel and it seemed to do the job without swelling orings like petroleum does.