Building instruments from many exotic woods for almost 50 years has caused me a few problems. Black walnut is known to be troublesome, and I have found that wearing a mask and gloves helps a lot. I can no longer tolerate cocobolo, and paduak is an absolute NO for me , causing severe dermatitis within minutes of exposure. I try to keep sanding to a minimum. Planes, scrapers, and even rasps are much better, and easier to clean up after.