Originally Posted by
Handcraftsbyjen
Marci Baker has a Corner Cut 60 and Sewing Edge purple that kf you use both you can accurately sew a scant quarter, a true quarter or a generous quarter.
I really like these two products - the seam measurement tool is just great and the purple edge stuff sticks a good long while. The only problem is that the back of the purple stuff loses its stickiness as it collects lint. If it gets sewing machine oil on it, the sticky part rubs off. You can only wash it in plain cold water.
I'd been using stacks of blue artists' masking tape - it doesn't stick as well as the purple strips do, but it works okay. I've heard moleskin works well, but I've never tried that.