I have been doing spring things with the bees, you know like cleaning bottom boards reversing supers, that kind of stuff......
I noticed on some of my screened bottom boards, the screen is pretty rusted, I,ve been thinkin to myself, man.... I just bought those last year
that must be the cheapest Galv. screen you can get...
Then it dawned on me...formic acid I did last fall.....years ago I was trying to clean some stone at my bench in my shop< I was using meratic acid, I forgot to put the cap back on and left it on my bench.........
two weeks later I needed a tool and went to my bench and every thing was rusted......duh
So, if you ever use formic acid with a screen bottom board expect it not to last....!
JUst thought I would share........!