I've made some of the homemade SHB traps with corrugated plastic with crisco holding the boric acid in. Then it dawned on me. Will the boric acid that has spilled/stuck to the outside of the trap harm the bees?
I see not many answers to above. I wondered about the same when I was watching the video.
As far finding it: It's Roach killer in Lowes --- I believe Roach Proof. Look at ingredients.