If you go to a hardware store or a sports store that sells tents they make a product called "Tear-Aid" They make different kinds. When my poly perimeter on my unit tore I went and bought "Tear-Aid - Type A" It's made especially for poly and other similar materials. It's very strong and waterproof. So google it and you'll find where you can buy it. It worked well and I wore it for about a month before I bought a new unit. It's great for emergency situations.