Patching a Tube

Procedure

1. Find the puncture

   Inflate the tube and listen, or submerge in water and watch for bubbles. Mark with chalk or a pen.

2. Dry and rough up

   the area around the hole with the sandpaper. The patch needs a clean matte surface to bond.

3. Apply a thin layer of rubber cement

   over an area larger than the patch. Spread evenly with your finger.

4. Wait for the cement to dry

   — should be tacky but not wet, typically 2–3 minutes. Looks dull, not shiny.

5. Peel the foil from the patch

   (don't touch the adhesive side).

6. Press the patch firmly onto the cement

   centered over the hole. Hold for 30 seconds.

7. Inflate slightly

   to test. If it holds, fully inflate.