Btw... My raw ns flicks on and off as you twist from low to high output settings and requires a very firm twist to activate the higher output level. Other raws don't seem to have this problem. Would you happen to know the cause?
For copper alloys, plain old sewing machine oil is all you need, or a light lithium grease if you want a more heavily-lubricated feel. Petroleum lubricates metal better than silicone anyway. I looked into this years ago for non-flashlight-related reasons, and all the silicone products I looked at said they were intended for metal-to-nonmetal or nonmetal-to-nonmetal use only.