Jan in VA

Here's a trick that I developed when I had my first top with bias edges. I freely share it with the QB.
It uses narrow twill tape, found in the hem tape/blanket binding/rick rack section at Joann's.

Twill tape has NO stretch and is narrow enough to be sewn into the seam allowance along the edges. You will need several packs to go around a large quilt, measure before buying.

This graphic was drawn for a braided border, but can be used in a similar way for any bias border. Carefully ease tape onto the edges of the quilt and sew it down. Include it into the seam allowance when the next borders or the binding is added.

Jan in VA