Tubs

It's the recommended technique from the huge thread on WW about glueing tubs.

No proper mechanics on there to suggest how to save 2 3/4 days?

WW are weirdos that spend their lives saving up and then days weighing stuff just in case the earth's magnetic field changes their gram count a smidge. Closet retrogrouches..

So they aren't too bothered about their tubs sticking

The lesson here seems to be that whatever you're doing with tubs, you're doing it wrong and will crash and hurt yourself.

Every single guide seems to give different, and conflicting information about everything.

Looking at the instructions for gluing tubs that came with the Continental rim cement, it specifically instructs you to avoid putting your foot on the tyre when stretching it to fit. On the back of the packaging for a Continental Giro, it recommends using only the Conti cement, but also stretching out the tyre by standing on it and pulling it up to stretch it out.

Chip Howat, a professor at the University of Kansas, is the foremost expert on tubular gluing and adhesion. He has literally written the book on proper installation techniques and ranked the performance of the bike industry’s tubular adhesives. We were the first to talk to Howat about Continental’s new glue, which after testing he recommends for use with carbon tubular rims.

“It did well,” said Howat. “I did four separate tests: one with [Vittoria] Mastik One, one with conventional Continental glue, one with the carbon glue following the manufacturer's recommendations and then one using the carbon glue and my procedure [three light layers of glue on the rim, one on the tire]. Using my gluing procedure against the standard [Continental] glue, it looks like 20 to 25 percent better. [With their procedure] it’s still good, better than conventional, but only marginally so.” Howat hasn't yet tested the new glue’s heat resistance.

Howat’s method for gluing is a process that one of his students earned his master’s degree testing. “We tested every procedure that we knew was out there and then developed our own,” said Howat. “We found that multiple layers on the tire — now these were all conventional glues, before the carbon glue came out — didn’t make a difference; one coat was sufficient. What really made a difference are multiple coats on the rim. We tested one coat, two coats, three coats, four and five coats, and we found that diminishing returns set in after three coats."

http://www.bikeradar.com/gear/category/components/tubular-adhesive/product/review-continental-carbon-rim-cement-44556

I'm hoping Chip was right.

Are you using a Conti Giro? They aren't the same as any of the high end tubs.
(which you should definitely not stretch, but which can be a bitch to fit)
I think you can stretch the Giro because they aren't bonded but sewn up.
The only thing I would say is the glue only needs to be touch dry prior to assembly. It probably doesn't matter much, but we would always leave glued wheels and tyres covered up with a sheet between applications and before fitting, because dust could be a problem. So for that reason the only long gap between final glueing and fitting was lunchtime.
Leaving them longer than a couple of hours never happened.
Once fitted we would leave them inflated to maximum overnight to make sure they were bonded as well as possible, and also to sort out the faulty ones.

http://www.bikeradar.com/gear/category/components/tubular-adhesive/product/review-continental-carbon-rim-cement-44556

I'm hoping Chip was right.

That sounds right, we did two layers on the rim, one on the tyre.
When I did my own (which was a long time ago) we used to build up several layers on the rims and a two thin layers on the tyre, the first to seal the fabric, and the second was a nice smooth layer on that.

It's not a Giro, I just happened to be reading one and was amused at how Continental could seem to have two conflicting sets of instructions.

They're Conti Tempo, which probably means they will puncture while I'm riding the mile to the velodrome and all of this discussion will be moot anyway.

It's not a Giro, I just happened to be reading one and was amused at how Continental could seem to have two conflicting sets of instructions.

Its good that its not the Giro. The Giro is NOT made by Conti but OEMd from, I think, Lion Tyres (Thailand). Its a heavy, puncture prone tyre without merits. A friend, meaning well, gave me a case of them and they did not last. My sample was large enough to dismiss any "bad karma".

They're Conti Tempo, which probably means they will puncture while I'm riding the mile to the velodrome and all of this discussion will be moot anyway.

Tempos are OK. They are like Sprinters but with less rubber. Not the longest lasting tyre for the road but more reliable than the Giro... a lot of Pros use them in TT and mountain stages. Tempos are quite common on the track. They are, I think, Contis most popular track tyre.

Waiting 24 hours between glue layers is never necessary.

Ok, received and understood.

I waited 24 hours too as per the WW guide. Oh well, cant do any damage

or maybe it can, if you live in a dust pit like I do

Waiting 24 hours between glue layers is never necessary.

necessary? No. Does it hurt? *NO*.

How long should one wait?
I wrote in my instructions "Let Dry (between 15 minutes and 12 hours depending upon mastic used)".

I waited 24 hours too as per the WW guide. Oh well, cant do any damage

or maybe it can, if you live in a dust pit like I do

Unless you live in the Sahara and its a sand storm... Normal house dust does not matter.. Mastic is not like normal household contact cement. Its sticky, gummy and elastic when dry and flows when warm.

...How long should one wait..?

Not sure, I've never used tubs before.

So, the tubs are successfully mounted, and....

The front one is punctured.

Ffffuuuuuuu......

pitstop

Ordered some. Forgot to get it sent to my work address. Won't have it in time to race tomorrow.

Ouch. Were they punctured before you installed them then?

No, but there were a few nicks in the tyre already.

I believe so. My fault- I didn't check them before installing them.

Pumped the front up to ~160 psi and heard the leak.

D'oh!

Tommmmmmmmmmm- PitStop is a five minute fix.

They held 100+psi for a week before I took them off, but whatever hole it was probably didn't react to well to being deflated, ripped off a wheel, stretched, and then reinflated to 160psi.

I won't be coming home to collect said Pitstop before heading down from work to the track. I'll have to go half crabon for tomorrow.

It could well be that a weak area ruptured at that pressure, or my carpet is sharper than I thought.

I've got a can of PitStop, unsurprisingly- what time are you tracking?