Another low risk attempt might be to replace the 9 year old core with a new one?

https://cimg5.ibsrv.net/gimg/bikefor...29d4833d7.jpeg

Couldn’t possibly use anything other than an Italian-made engraver/scriber for keying the tyre bed of my Record Pave rims. Always scribed parallel lines on new rims back in the 80s/90s and never should have neglected that step last year when sandpaper didn’t scratch the surface…

^The Horror!

Final report on my very slow leaking Schwalbe One tubular:

Sealant took care of the leak. :D The tire was still holding at 100psi this morning after adding Effetto Mariposa Caffelatex sealant yesterday morning and pumping to the same. Now I just have to ride the Paramount every week to keep the sealant from pooling at the bottom and hardening.

Interesting. In four decades on sew-ups both garbage and excellent, I've never seen displaced bubbles if the tire is in good shape. The path of least resistance is through the puncture or at least very close. I do pinch the tire to look for tread cuts in the area to be doubly sure though.

A small vessel of water and dish soap is even better I think. You brush it on generously, and where the air escapes, there is a large and obvious bubble.

Nine years?!?!?!?! You're not riding that nearly enough. You should eat a tire in no more than two seasons. ;)

I will defer to your far greater experience. Perhaps I had one bad experience and never went back. I do have a tire right now that I could have another go at it with.

I've been riding tubulars since the 80s and I have also experienced what @L134 is describing. Not often, but more than a couple times. I have submerged a tubular to find small bubbles emanating from a general area of the sidewall (say a few inches long), and not always exactly where the puncture is. This seems to me more likely with a well-used tubular, especially when the sidewall has been scuffed in a particular area. Some people apply a sealant such on the sidewalls (I use barge cement on the sidewalls of my Dugast cyclocross tubulars) which might also affect where the bubbles exit. I've also experienced air coming out from the casing in the gap around the valve only to find--after peeling back the base tape and opening up the casing--that the puncture is not at the valve. :notamused:

A dried out casing may indeed give a false indication, but I try to touch up areas like that with latex emulsion because the bare casing is more prone to abrasion damage. In any case, pinching the tread around the bubbles should give you an idea where the damage lies.

Valve hole bubbling might indeed be displaced, but when I've had that, it was leading to an irreparable failure of the stem on some Vitt CXes.

Please share your source for liquid latex. In decades gone by I used the Jevelot product which came in a small jar that was good for many applications. Alas, Jevelot and Hugh Enochs are no more. I'd appreciate any lead on a substitute. I tried using tire sealant but it didn't adhere as well as my memory of the Jevelot product.
Brent

The stuff I use is Val-A Tear Mender which is a light natural latex emulsion much like the Tire Life product.
I also use this to stick the base tape back down after restitching cotton sew-ups. The main issue with either of these is the rather short shelf life once opened; in my experience, the rubber tends to fall out of suspension over time. Evidently carpet layers use some sort of latex emulsion as well, but I've not had any experience here. If you investigate this and can let me know of a good brand, I'd be very interested especially if it's cheaper than the Tear Mender.

Let me state loudly that I've never found a good base tape repair adhesive for Conti Sprinters. Those seem to be a one-and-done tire unless you like riding on dicey base tape.

I finally had a chance to test-ride my sealant filled Schwalbe One tubular. 20 miles and no air loss! The ride also gave me a chance to check the road worthiness of the leather handlebar bag I just completed. More on the new bag can be found in the DIY Bag thread.
https://cimg1.ibsrv.net/gimg/bikefor...637e8af6eb.jpg
As mounted on my '71 P13 Paramount with other leather projects.

This was news to me. I couldn't find it with a few searches. Got a link?

DYI bag making thread.

Here's one option:
https://m.media-amazon.com/images/I/...L._SL1500_.jpg
https://www.amazon.com/Liquid-Latex-...r_1_18?sr=8-18

I suspect theatrical makeup latex would bit a bit too thick much like mold makers latex.

Hey, sorry, this question is probably answered somewhere in this long thread, but are 22-23mm silk tubular tires with latex inner tubes for the road still being made? I’m in the US. Thanks in advance.

Available direct from FMB in France…

https://fm-boyaux.cc/en/route/28-82-.../36-largeur-22

No affiliation.

Excellent…….thanks!

rene herse has fmb https://www.renehersecycles.com/shop...-700c-x-23-mm/

Thank you!

Got them, I’ll install them soon!

I read on the FMB and René Herse websites that these tires are hand made in a small shop in Brittany, France. Yet on the tires I received directly from FMB there is embossed an inscription in English: “Made in Thailand”. Hmmm.

https://cimg6.ibsrv.net/gimg/bikefor...64089f7ef.jpeg

Just the tread?