Gas stovetop repair: What anti seize to use on brass fittings?
If you are tightening brass fittings to the point where they seize, you are tightening them way too tight!
Propane and natural gas at the stove or oven normally only have approximately 0.75 psi in residential, and 2 psi in commercial in my area. By the time it's being throttled at a Venturi/air mixing point, it's less than that.
The only thing that should used on gas pipe threads is listed PFTE tape, normally yellow or yellow listed pipe dope. If you are seizing fittings you have the wrong threads matched or are way over-tightening the fittings.