OK, here's the drill with the Rema Patches. Flex the tire and squirt some superglue in the cut. Turn the tire inside out so the cut is forced closed while the glue dries and so you can get to the inside of the hole. Abrade the area around the hole to at least 1/4" bigger than the UP, do a good job. They come in a UP3 = 30mm in diameter 1 1/4", 4.5 = 45mm 1 3/4". Apply a good amount of either Rema Blue Glue or Rema Special Cement BL to the abraded area, bigger than the patch. The difference is the Special Cement is non flammable so can be taken on airplanes. No big gobs, just a thin even layer. Allow it to tack off ie not sticky, don't touch the area where the patch will go. Peel off the foil and apply the patch carefully by rolling it on from an edge, don't touch the surface of the patch, use the clear plastic. Next, since you likely won't have a patch roller, use something smooth and hard to pound on the patch with the inside of the tire supported on something hard. Tire shops use a hammer for this. You can also use a coin as a roller. Lots of pressure, this helps the patch vulcanize to the tire so don't miss any. Then flex the patch so the plastic snaps in the middle and you can peel it off from the middle out. Don't peel from the edge, the vulcanizing takes a while, especially if it's cold. Now you can turn the tire back the right way out. SO you end up with a permanent boot, because the patch has crossed cords in it. Note the radial patches only have cords in one direction, like radial tires. The UPs are designed for cross ply tires like old style car tires and bicycles.