I took one of mine off last nite. Cleaned the snotted old adhesive with methyl ethyl ketone and let it dry. Also cleaned the steel pad. Then applied the SEM plastic adhesive assistant and let it dry.
I found some E6000 that RED58 mentioned and applied it with a stiff brush. Spread relatively easy with out clotting up. Then pplied the pad to the steel and weighted it down.
This morning it seems stuck. But the test will be if its still stuck on in a year.
So if nothing else maybe the answer is a deep cleaning of the pad to remove the silicony stuff.

Please feel free to offer up any insight you may have.
Thanks John

PS. I also inquired at JC but havent heard back as yet.