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I felt the Vacseal on one of my tubes about a month after sealing. It had cured beyond the "almost tacky" stage, but it didn't feel as hard as, say, cured varnish. This was casual feeling with a fingertip, not scientific inspection, and there's no way to know what's going on under the surface, of course.
I've been told that these leaks, when they happen, are at the microscopic level. If you apply something like glue, my question would be whether it's truly impermeable in the first place. A rubber balloon seems impermeable when you blow it up, but it eventually deflates because gas passes through the material.
We're all just guessing until John & Bob can apply some science to the question. I put Vacseal on my tubes on the theory that it probably won't hurt and it just might help. They don't leak now, but they had gotten through the previous 50+ years without leaking, so the fact that they haven't leaked yet tells us nothing. Vacseal is expensive stuff, but cheap compared to the cost of a good 15GP22.
Phil Nelson
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