Gene Prince asks: "How about the newer compounds like B-72; anyone
tried them for stability &
abrasion resistance?"
 
We have been using B-72 (and some other B-?? stuff) for about seven
years, and so far it seems to work quite well...far better than nail
polish, but who can say about the long haul. Maybe we'll soon be
placing epoxy microdots readable by miniature SEM-based bar-code
readers...
 
Dan Mouer