Hi Bob,
Scotch (3M) "206" (and its counterpart, the thinner 207) were called "high output/low noise" by their maker. They were +3db formulations, backcoated. I have used quite a bit of it, both way back when and recently. Have never had a problem with sticky shed, but the tape I have used has always been stored correctly. It is probably my favorite tape for use on my older Teac machines (A-3300S-2T, A-3300-SX, etc). I believe it is as good as Maxell UD, although some others feel it isn't. The only equivalent that I know of might be the now out of production Quantegy 406/407.
Thanks for the mag polish tip- will have to try it soon!
Kent