I think your success was due

Stephen Richard

I think your success was due to the frit at the edges to allow the burn-out of the adhesive.

In general, do not use foil with adhesive, especially in sheet form.  It turns everything black and blows big bubbles usually.

Stephen Richard

blogs at: http://www.verrier-glass.blogspot.com/   and  http://www.glasstips.blogspot.com/

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