Reply by drobertson

Thanks GrandpaLen, the Camphor idea looks very promising. It seems to work by preventing oxidation rather than extracting moisture. In my case I think fighting humidity would be a losing battle.

It will be interesting to see if my wife puts up with the smell. She does projects in that shop also and hates smelly things. Maybe I can sell her on the keeps bugs away idea.

Your idea also gets the award for cheapest and easiest to try. I can easily get Camphor this afternoon at the store.