As an "old-timer" I think this problem will never be solved to everyone's satisfaction :--). Fingernail polish does pop off after a while but is readily available, but you better publish in a hurry. Some artists varnishes & laquers turn yellow or brown in time making numbers difficult to read. How about the newer compounds like B-72; anyone tried them for stability & abrasion resistance? Our successors, archaeologists, conservators & museum people are probably always going to curse us one way or another. Gene prince