You asked for it, we got it! No more fussing over creases and folded edges. When drawn over your fabric, this amazing pen softens the fibers, causing them to relax along the line. Now just fold the fabric over using a finger or iron to form a sharp, lasting edge. The fluid is not affected by the iron. Makes applique and reverse applique easy. Great for English paper piecing! No more waiting to use an iron in classes. With the Fabric Folding Pen, you'll be able to get to work right away. Refillable. Mix a few drops of the concentrate with water and your back in business.