Originally posted by Brett B:
Use Vibratite VC3.
https://www.amazon.com/Vibra-T...admate/dp/B008D6GHY6It doesn't harden like Loctite, rather it stays as a rubbery polymer once it dries. I have used it on my Osprey 45 with pistols and my MPX and it works perfectly. It provides just enough extra friction to keep the can from coming off unless you want it to.
It's also very easy to clean up the threads with isopropyl alcohol, so you are not going to damage the threads on your can by trying to scrape out old Loctite. It's not high temp rated like Rocksett, but my pistol cans don't get nearly as hot as my semi-auto rifle cans. So the temp range it works in had been just fine for pistols and for thread protectors.