What causes your bicycle tire to go flat? Slivers of auto glass, tax, hair wire or even a stone imbedded in the tire will do it. Large pieces are easily found. Examining the circumference of the tire is often spotted by accident very quickly. If there is a problem with puncture repair familiar there is a couple of issues.
A hidden object still left in the tire for one. Every time you inflate the object punctures another hole in the inner tube. Budget two dollar shop repair kits can be problematic. Once the cement is opened and used once and stored ready to need again the cement and patches don't seem to keep. The cement doesn't seem seal the patch properly rendering the patch useless. It is a common cause of puncture repair failure.
A big help in protecting the inner tube is another old inner tube used as a shoe inside the tire. The old inner tube acts as a double skin protection. Cut off the valve stem of the old inner tube.
When you come to reassembling the inner tube and tire doing one at a time is actually faster and easier. Start with fitting only one side of the tire into the rim leaving the other side outside.
Take the old inner tube and feed it all around the inside the tire as you would normally fit the actual inner tube.
Next the inner tube is feed the same way.
No hole can hide from an under water test. Immersing the inner tube eventually you will come across a bubbling column. Tiny pricks are very tricky. They are so tiny as soon as you remove the tube out of the water you will loose site of the hole. It may take several attempts at re-immersing to keep track of the hole every time you dry the concerned area. You can only do the best you can. Once you have site of the tiny prick, with ball point pen circle it before you loose site of it again.
If there is no obvious bubbling check again this time, if there is a previous patch, or the valve, wait for several seconds under water for any sign of a single bubble struggling to emerge from the edge of the patch or from the valve.
It is critical to deflate the inner tube vacuum flat or the roundness in tube tend to lift the edges of patches where they tend not to stick here creating leeks in the edges often the cause of puncture repair familiar A technique is to roll up the tube into a ball and pressing the inner core valve in. The pressure will insures vacuum flatness.
Don't remove the silver backing of the patch just yet lining the patch right in the center and with a ball point pen trace a template. The resulting template insures you can see what you're doing aiming the hole in the tube in the center of the patch and spreading the cement to the edges.
With a scrapper such as a cheese grater like scrapper provided in the repair kit or some sand paper the surface of the tube in and round the template is cleaned to a dull mat finish.
Now we a ready to apply the cement
If you're using a brand new kit, unscrew the cap. In the top is a little pin. Turn over and pierce the silver seal. Don't empty the container or you will end up purring a messy glob. Squeeze a glob right on the inner circle.
Spread the rubber of the tube to widen the hole letting the cement drain into it to help plug it. Screw the cap back on the container using it to spread the cement covering beyond the perimeter of the template. Don't spread a thin layer or you will have a puncture reaper failure problem the patch won't stick. Spread a past spreading a thin layer from the center outwards.
You will notice the cement dries sticky. You can tear off the silver backing of the patch. It is not really necessary, but is helpful to spread some cement on the underside of the patch to insure you have covered your bases to the edges of the patch. When like seleotape line up the center circle in the center of the patch and press on.
You will only have one shot at this because the cement will stick fast. Watch your eye angle coordination is squaring the patch exactly to the perimeter of the template. Use a round edge of your pen smoothing round the edges. Don't Concentrate so much on the center but the edges of the patch.
Now the the inner tube can be reassembled back into the tire.
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