Black Walnut is toxic to plants and animals. When I work with it I always use a dust mask, and even then it irritates the mucus membranes in my nose...
I recently dried some 2" maple indoors, had it strapped with ratchet straps which I kept tight as I could, the boards still twisted, but I think less...
the tabletop I put on top was more to hopefully fill all the little cracks, which it only sort of did. I ended up planing it all off (just barely and...