The most time consuming and also one of the most frustrating part of sewing is adding a seam allowance Save hours! We want to sew and we want to do it NOW! The most time consuming and also one of the most frustrating part of sewing is adding a seam allowance to all your pattern pieces. Using the Seam Allowance Guide you no longer have to measure and trace around each individual piece, the Seam Allowance Guide will do that for you while you cut out your fabric, so you can spend more time on the fun stuff.