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Yes. The copper foil is what the solder actually binds to. Not going the whole way around could allow the foil to eventually start to separate from the glass. You need to actually solder the glass, in most cases, to the frame to prevent movement of the glass inside the frame. The back of the foil also is colored. If you do not use the foil the entire way around the piece, you will see a color difference along the edges of the individual pieces when looking through the glass.
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