Call me insane but I add bentonite to boiling water just enough to make it thoroughly wet and refuse to wait for it to fully hydrate before adding it to primary. With wine mind you, still learning mead. I prefer gelatin or egg white finings for secondary with wines and tertiary rack no more than 2 weeks after I decide to add it and cold crash.
Teflon non stick is your friend for bentonite. Ones it drys its a real pain to get off stainless or ceramics.