If you want to glue, and the glass shop has no clue, you might do well with UV
curing gel. The local nail salon will have this, and the light to cure it, too.

I believe it is a generally a UV polymerized methyl-acrylate. The clearcoat gel
is actually what the repair tech used last time I had a chipped windscreen. Yes,
it really was the nail polish prep. As good a match as the previous repair with
the windshield specific stuff-- not perfect, but not very noticeable. The nail
gel cures with UV-A, wavelengths in the ballpark of 360 to 400nm (near visible
UV-A to the shortest visible blue), which, conveniently enough, most glasses are
fairly transparent to.

What is the worst result? It doesn't do it and you need to soak the thing in
acetone for a while to clean it and start over?
Cleaning/prep would be acetone and light brush for loose debris. 
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