Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Very Slow Leaks.
Date: Tue, 6 May 2025 14:33:02 -0500
Organization: Yellow Jersey, Ltd.
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On 5/6/2025 1:41 PM, Frank Krygowski wrote:
> On 5/6/2025 1:42 PM, Jeff Liebermann wrote:
>> On Tue, 06 May 2025 10:19:59 -0700, Jeff Liebermann 
>> <jeffl@cruzio.com>
>> wrote:
>>
>>> I once bought some inner tubes that seem to have come 
>>> from the factory
>>> with leaks. (...)
>>
>> A bit more.  I didn't have enough patches handy, so I used 
>> a small
>> blob of automotive "gasket maker" to plug the hole.
>> <https://www.permatex.com/products/gasketing/black-gasket- 
>> makers/permatex-ultra-black-rtv-silicone-gasket-maker-5-oz/>
>> I didn't ride enough to determine how many months or miles 
>> the black
>> goo was going to last, but it seems like it would work on 
>> small pin
>> holes.  I don't recommend it for large punctures, long 
>> cuts or cracks.
> 
> Please do report back on that once you've got some miles on 
> the tire. I take it you let it dry in place before 
> reassembling the tube & tire? That would prevent the 
> technique from being useful during a ride.
> 
> I've never used a compound like that for its intended use, 
> i.e. replacing gaskets. I've almost always just used the 
> proper gasket for whatever I was working on. A few times 
> I've had to cut my own gaskets out of gasket paper. I'd be 
> interested in feedback here on how well that stuff works. It 
> looks handy.
> 
>> Also, I had some slow leaks that were difficult to find 
>> using soapy
>> water.  (At the time, I didn't think to try the ultrasonic 
>> leak
>> detector).  So, I over-inflated the inner tube.  I think 
>> it's probably
>> 26 x 1 3/8:
>> <https://www.learnbydestroying.com/jeffl/crud/inflated- 
>> tube.jpg>
>> Not only did the soapy water detect the leaks, I could 
>> hear the air
>> leak and also feel the air with my fingers.  Also, the 
>> normal size of
>> the tire is the mounted tire located behind the over- 
>> inflated tire.
> 
> I almost always inflate my flatted tubes much more than what 
> your photo shows. I think it helps a lot. I rarely have to 
> dunk a tube to find a hole. Passing the inflated tube close 
> to my face usually allows me to feel the air escaping, 
> especially if the stream hits my lips or thereabouts. 
> Working in a quiet basement workshop (where I do most of my 
> tube patching) also helps a lot, I think.
> 

Me too on paperlike gasket material, but we're old. A lot of 
modern systems specify a gasket sealer:

https://www.3m.com/3M/en_US/p/d/v000087446/

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971