Phase I of the testing complete but unfortunately I may have used damaged goods. these are very old decals. When this thread started I had read someplace about using dull coat. So the sheet got a coat of dull coat and that did not help to begin.
Per information in this thread, I tried a few individual decals with Pledge and a few with testors glosscote. Unfortunately I had no choice but to apply this on top of the dull coat previously applied. the result of this was that long decals did not come off, except in pieces. Small "PRR" logos did come off in one piece with both of these products. More decals should arrive on the 28th and will start them from scratch.
PS- typically I soak the decals for about two minutes, and then let them stand. every 30 seconds or so I try to gently slide them off.