The cut is a long "snake bite" (two parallel slits caused by hitting a curb). The tube is already covered in more than 3–4 patches.
This is the most important step. Use the small square of sandpaper in your kit to roughen the area around the hole. This removes the slippery molding agents from the factory and gives the cement a textured surface to grip. Bicycle Inner Tube Patches
Spread a thin, even layer of the fluid over an area slightly larger than the patch. Wait 2–3 minutes. The fluid needs to be "tacky" or nearly dry to the touch before you apply the patch. The cut is a long "snake bite" (two
Finding yourself on the side of the road with a flat tire is a rite of passage for every cyclist. While many riders simply swap in a new tube, knowing how to use a patch kit is a vital skill that saves money, reduces waste, and ensures you aren't stranded if you run out of spares. Use the small square of sandpaper in your
Not every tube can be saved. Replace the tube instead of patching it if: The hole is on a seam. The damage is at the base of the valve stem.
These kits come with a small tube of "rubber cement." This isn't actually glue; it’s a chemical agent that melts the patch and the tube together into a single, seamless piece of rubber. Once cured, the patch is often stronger than the rest of the tube. How to Patch a Tube in 5 Steps
Peel the foil backing off the patch (try not to touch the sticky side) and press it firmly over the hole. Use your thumb to apply heavy pressure from the center outward to work out any air bubbles.