Originally Posted by JARblue

I was working with 1' squares, which made it much easier I think than if I had a big roll. I stuck one square in there with the plastic still protecting the sticky material and molded it where I wanted, with one edge lined up against the vertical seam. Then marked at the fold or just pulled out the folded square, cut where needed, and applied the piece. Then measure the next area the same way. I only did this on one side because I had a limited number of squares for the entire hatch, but it was very efficient with little waste and excellent coverage