sarge1

Hello friends, I have started an appliqué quilt, using the starch-with-a-paintbrush-then-iron-under method to turn under the edges before hand sewing. It's working well, but I'm seeing "water marks" along the edges. Is this normal and will it wash out, or am I doing something wrong? I've prepped 2 blocks out of 30, but don't want to go any further until I know it can be fixed. Pic for explanation.
Thanks!