On the topic of the "sticky shed" phenomena... If "baking" the tapes doesn't work (and a word of caution: baking only works for certain tapes of certain age and make... people online have figured out most of the ones that do or don't work, but, be mindful of that before plopping any tapes in the oven) I have had success on cassettes that are sticking by spraying the entire spool with dry silicone lubricant and apply the lubricant to the entire length of the tape -- see here
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