Found a weird fix for a loose scope mount last week

I had this old hunting rifle come in with a scope mount that wouldn't stay tight, no matter how much I torqued it. On a whim, I cleaned the threads and put a tiny bit of clear nail polish on them before screwing it back together, and it's held solid for months now. Do you folks use anything similar for temporary thread locking, or is there a proper gunsmith solution I'm missing?