Are my gaps too large? Does the foil look ok? Thanks for any

Bundle includes 3 12-Ounce cans of Great Stuff Insulating Foam Sealant Big Gap Filler Fills, seals, and insulates gaps greater than 1 inch Great for

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Should I grind down all the edges slightly before apply copper foil? Will be filling in all the empty space with blue cathedral glass (the one square) : r/StainedGlass

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Are these holes along the edges normal? : r/MachineEmbroidery

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Are these holes along the edges normal? : r/MachineEmbroidery