Material to make patches to fix Crosso / Ortlieb style waterproof panniers? I've got some panniers to fix. I've bought some impact adhesive and I am working out which material to buy for the patches - will PVC ok ? or polyurethane or something else?
Has to be waterproof and strong and preferable available in yellow!
You could try an air bed repair kit? 
The patches are tough, the bond is flexible and air tight.