February 28, 2016: The patch has remained in my tire all winter, and the tire has held at least some air all winter. The weather was nice yesterday so I took a 15 mile ride and the patch is still holding up great. After the ride I was able to see that my pressure was 83 psi. Everything has gone very well with this first design. I am still trying to figure out what to do with this, since the flexible patch would cost so much to make.