Plug a hole in a blow-up mattress

I went camping with my sis and her friends last week in Canada (thanks Tessa!) - we had inflatable air mattrasses for extra comfyness, but they kept deflating. Luckily I had sugru! In this one I replaced a missing valve cap that had been unsatisfactorily plugged with duct tape before. There were two valves so it was fine to permanently close this one. It worked perfectly! Jane, London