Anybody have any thoughts on my filling my 700x25/28 road tubes with just a bit of pure silicone lubricant to "seal the pores" of the tube's Butyl rubber. This would be in an attempt to not have to fill my tires before EVERY ride to keep them @ 90psi. I currently lose about 1 or so psi per day in these skinny puppies even with new tubes. I would like to not beat on the lil' Presta valve so frequently.
I got this idea from the refrigeration industry where they found that the "mineral" oil used for the older R-12 systems actually had a side-effect of sealing the porous rubber refrigeration lines of an automobile A/C system so that they can then be converted for use of the newer R-134a refrigerant which has a smaller molecule size and would normally require the use of new "barrier" hose to keep them from leaking.
The choice of pure silicone would be due to the fact that it is totally compatible with Butyl rubber as Butyl rubber is not suggested for use with petroleum-based lubes. I don't like SLIME as it is much heavier and has a documented and limited life.
The only down-side I would anticipate would be when a puncture happens one would have to remove the silicone that might escape but it would seem that a bit of rubber glue could be used to remove this small leakage from the puncture site prior to actually using more of the same glue for the final patch application.
I am testing this method now...