I've used a lot of both PSA and H&L abrasives.
Trust me, PSA is a real PITA.
If I could ever find 8" H&L, it would be the last time I would buy 3M, Green
Stikit discs for a foam pad.
Abrasives are not a place to try to save money, IMHO.
The problem is the PSA adhesive itself.
After a few disks, the pad starts getting gummy from the old adhesive, so
you have to stop and clean it before continuing..
Fortunately, the hull fairing is complete, even though it took 3 years, so
have no further need for PSA.
BTW, these were 50 & 80 grit disks.
For openers, these disks were used on epoxy fairing compound which is
abrasive and very dusty.
Epoxy fairing compound will wear a sanding disk away to zilch very quickly
so there was a lot of disks being replaced in a short time.
I don't have a clue about the weather but I'm in SoCal which translates to
zilch humidity and warm but not really hot (high 80's this week) days.
For me H&L simplifies my life and H&L disks are competitively priced, at
least for me they are.
That may be it. If you are effectively wearing away the part of the dish
that holds every thing together there may be nothing substantial left to
pull the adhesive away from the pad. That normally does not happen when
working with wood.
If that is the case, I can sure see why you would prefer H&L. It all
depends on your needs and how you use the disks.
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