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4' would be a fairly long crease with hot glue, even with two hot guns to start with. For a crease across the grain, I don't cut all the way through - I just use a blunt tool with maybe a 1/8" end diameter (3mm) to make a crease that the material will follow easily. Such a groove makes a good guide for the tip of a glue gun or a small, just-lit torch flame. Hot glue or silicon can be added after the initial folding, too. The creases don't need to be straight, either.
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