Zippers can feel like a wild beast that can never be tamed,” says Mike Boatman, owner of Boatman Marine Canvas in Oklahoma City, Okla. “When you start working with zippers for the first time, you find out really quick that it’s not as simple as sewing the zipper onto a piece of material.”

Although Boatman has been dealing with the “wild beast” for decades, working on zippers has […]