OK, I did some testing... here are the pics
This one was done with 1/4 bias prefusible trifold stips. The only way I could get that little curl was to ease the fullness on the inside curve. Can you see it... In the end, it is barely noticable. But I had to press it into submission before stitching.
This was done with 1/4 fusible tribold bias tape
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Here it is in full size
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