Old (unopened) tubular glue - ok ?
 

Probably 20yrs old. Maybe more. I do still have a bike with sew-ups as well as something I just put together using older wheelset that I need to glue new tires onto.

I know - maybe not worth using. Just curious.

I would not hesitate to use it if it's still liquid.

20 years? Glue is inexpensive. Better safe than sorry (cheap insurance). Wouldn't want it to roll on a downhill turn.

If you took it to your LBS, would you want them to use 20 year glue?

If you can get it out of the tube, it can likely be thinned with Acetone and applied with a multi-purpose acid brush.

Not sure I would still use it.
I had some old contact cement (Pattex) that actually went bad.
It changed color and did not work well anymore.
Since tubular glue is similar, I would not risk it.

Squeeze the tube around a bit before you open it. It should be fine if still viscous.

thanks Peter,i still have a few unopened tubes of mastik from the mid 90's and was bit curious as well if they were even still usable.

I had some tubes of tubasti left over from the '70s. It sure seemed to still be very sticky, but I threw it away anyway.

When the glue gets old, taking about that is like honey color, that one gets too watery, open it and check the consistency of the glue, if watery then better not use it.

With the red mastik one never seen NOS of those tubes for some reason :P

No. Buy a new tube. Glue is not that esxpensive.

Stir it up with a spoke. Should be good to go. I recently had thee same issue with some Tubasti. Just use mineral spirits and a toothbrush to spread it out even.

I have to imagine new glue would work better than the old glue even when new 20y ago.

Give it a good deep huff when you open it. If it sends you places, then its probably fine.