Originally posted by Ryan S.
I have used Vaseline, but have a tube of Dow 111 on order.
Vaseline does not hold up very well in the heat produced by RMS motors. There are better choices.
Dow 111 is good for lubing your RMS o-rings but I highly advise against using it to lube your commercial RMS motor liners because it is actually too good. That stuff will stick to and lubricate anything you touch with it and it is a bugger to clean-up. It is hard to get off your hands and hard to get the dirty lub-and-propellant gunk out of your motor casings. Dow 111 is
good for lubricating mandrels when casting propellant. When using Dow 111, rule #1 is "a little dab'll do ya."
As has been mentioned, the Radio Shack grease is good, but my personal preference is a high-temp automotive grease which can be purchased at any auto parts store in a tube or can for a few bucks. I use this type of grease on my RMS closure/case threads, liners and O-rings, and the liners practically fall out of RMS motors. I use WD-40 and paper towels or pre-wetted baby wipes for general cleanup. I get out the Hoppe's #9 gun cleaner when there tough propellant residues that need attention.