Flat tire repair. How to fix a flat tire. How to plug a tire using tire repair kit, DIY. Fix a leaking tire yourself using a tire plug kit. Remove object from tire. Clean out hole with tool and install plug. Give the plug some time to dry, inflate tire and get! Finding the leak is important and will determine the type of repair or if it can be repaired. Small punctures or damage to the contact surface can usually be repaired depending on the size of the damage. Punctures or damage on the outer or inner wall of the tire are usually not repairable. If you're unsure, contact a local mechanic to ensure safe travels.