Anything other than silicone..

JIMNLIN wrote:
Simply put ...far more people have had issues with certain types of silicone's than have had good luck with them.

We also have service experts tell us what they found works and what didn't.

Not all silicone is the same.
See my reply above for a explanation why some silicone products stick and other didn't.

Acetoxy vs natural cure silicone....there is a difference in adhesion quality according to the pros that use sealants in their line of business.

And yet I've never seen the words "Acetoxy" or "natural cure" on a tube of silicone. I've always bought simple "100% Silicone" (not "siliconized caulk"), and it has indeed smelled like vinegar. Yet your description suggests that is not what should be used outdoors, and you really don't clarify which one will (or won't) stick to itself. :S