I did not know that R.H. was an issue with guitars!I have a different problem, the guns I have are guitars and humidity and wood are an issue. I have a 40 years old guitar I recently had the fret board re-done, I paid $50 for it cost me $200 to straighten it because someone didn't take care of it. It's essential to humidify the guitar case or create and environment suitable for the guitar 35% humidity above that the wood swells below 15% it cracks for warps.
I'm glad my brother takes care of the guns. I have a sweet over and under Browning 20 gauge that needs to be shot, but I think the barrel with the new loads might eat it up?
kv


