I've added a new page to the blog 'misc. tech stuff' to collect together info on abrasion resistant materials for use as a bottomsheet alternative to UHMW or PBT (which I can't source). I'm hoping to find something to play with in the home lab. Heat bonded nylon (although nylon does absorb some water) and sintered HDPE (after being ground up) seem to be the front runners but just researching at the moment.
Also, if you're an equipment junkie check out the great resource that Mirsad at Navis Boards put me on to.