Vinyl cement and Tenacious Tape. Its vinyl like the canvas, waterproof, long lasting and durable. SO far it is holding up (even the hole I put in the canvass with my angle grinder while grinding down the sharp edge that was causing the holes )Just curious, how did you repair the canvas? I think CCV, Sportsmobile and other van pop up companies could learn a few things from Four Wheel Campers. They have being making pop up campers for a long time and they have got the pop up materials down. Prior to the Sprinter, I had two FWCs. My last one was a 2015. It had no issues with the pop up material which was more of a light weight vinyl material but it was extremely durable when I recently sold it prior to getting the van.