I have patched the outer PVC in mine, and one pinhole in the inner bladder with the Tear-Aid tape.
From what I've read elsewhere here, the bladders are notoriously difficult to patch. If it were mine, I'd try roughing up the surface with sandpaper, then use Aquaseal and back it up with a PVC patch (also roughened up).
Try calling Aire?
Edit: maybe call RaftFix and see if they have a recommendation? Maybe they could do a patch covered with urethane?