This ^The 3m windshield gasket was the goto for years. You would basically consider the tire and maybe wheel junk after using it, because it would not come off. You can find it at any parts store.
This was more or less a last-ditch effort at stopping/slowing down the leaks. I was committed to this "repair" and the idea that if it didn't work, I'd be looking at new tires anyway.
Also, @R Q if you haven't done it already, it might be worth running a couple wraps of gorilla tape around the inner bead if you're going to pull it apart.