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.
Before putting the tube back in, run your fingers carefully along the inside of your tire. If the thorn, glass, or wire that caused the flat is still stuck in the tire, it will pop your newly patched tube instantly. When to Toss the Tube Bicycle Inner Tube Patches
If you want a repair that lasts, follow this process for a vulcanizing patch: Spread a thin, even layer of the fluid
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. Before putting the tube back in, run 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.