Reading the last couple of posts reminded me about Dycem, which is a non-slip material that we used to use when I worked at the Rehabilitation Institute. It's wonderful stuff. You put a piece of Dycem under a china plate, for example, and it keeps the plate from sliding around. Useful for neuro patients who needed to eat without the plate getting away from them. Look on their Web site (dycem dot com). It's really, REALLY sticky.