A friend of mine claims that porous (very slowly deflating) tires with inner tubes can be treated by the following procedure:
- Let the air out.
- Elevate the bike so the tire is of the floor (no external pressure on it).
- Use a spray-can with silicon grease spray to spray a fair dose of silicon in the nipple. (EDIT: Dunlop/Woods valve with the valve-stem removed.)
- Spin the wheel to distribute the silicon and wait 5 minutes to let it dry a bit.
- Repeat step 3-4 another 2 times to get the silicon evenly spread along the inside of the inner tube.
The rationale is that the silicon coating will seal the porous rubber from the inside.
(And needs to be applied 2-3 times because the first dose will stick to much to the inside close to the nipple, so it won't make it all through the tire. The 2nd/3rd dose will propagate further as it travels past the area already coated.)
This sort of makes sense at first glance....
Fact of fiction ? Whats your take on this ?