Leon wrote:

...snip long saga complaining about Klingspor PSA paper and extolling P-C
branded paper wrt glue stick on pads...

I have no idea who makes P-C's paper and it's been so expensive to use
can't comment on it directly. Similarly for Kingspor's PS papers--while
in general Klingspor is great value, I think their PS prices are
excessive. I have used Mirka on PC sanders w/ success and no
significant glue "cling" and 3M automotive papers with similar results.