crappy rubber cement?

On 2007-06-08, DeF (aka Bruce)
was almost, but not quite, entirely unlike tea:
Duncan wrote:
I had to crack open a new tube of rubber cement to patch the tube, and
its taken me three goes to get the two patches to adhere properly (not
leak). I've never had this problem before.. usually get them fixed
first go.

I suspect my latest tube of el-cheapo rubber cement that came in a no-
name patch kit. It certainly doesn't smell as toxic as the stuff
usually does.

Anyone else had this problem before? Am I just imagining things?

Well, I don't know if this is relevant to you or not but tubes can
be made of different compounds. I've found that "shinier" tubes are
not as easy to fix for the reasons you give - the cement doesn't seem
to stick. Do you roughen the tube before gluing?

And you absolutely must wait for the glue to dry before applying the
patch, otherwise the reaction doesn't happen properly.

(looking forward to the ride home in 30kn winds and driving rain.. not)


Come on, it's character building!

It snowed up here today! I saw little flurry things fall out of the
sky! I've not seen that since I was 2, and even then, I'm not sure
whether it was actually snowing, or whether we just arrived on already
existing snow.

Not enough today to settle on the ground, but currently 3 degrees and
dropping.

I love this ****. It's raining, the kangaroos are happy, the grass is
happy, the resevoir is not dire. Mind you, I haven't yet pulled the
bike out of the observatory's car. Said car was covered in an inch of
frost/snow this morning when we packed up the telescope.

--
TimC
Sign on door of computing lecturer: "If your project is 90% right,
I will give you a distinction, your employer will fire you." -- Zebee

Do you let the glue dry a bit to get tacky before putting the patch on?
Do you use the crappy little spice grater they supply for roughing up
the tube a bit first? I find a small piece of sandpaper works better.
I also appply the patch when the tube is slightly inflated. I mean not
stretched. Not quite enough to hold itself up.

What ever happened to those "vulcanising" patches where you hade a clamp
to hold them on and you were supposed to be able to strike the little
spot of ignition stuff to burn the cardboard fuel so it would generate
heat (and smoke) and hence cause the patch to melt on?

I haven't seen them in years. 20 at least. Can you still get them?
I never could get them to burn without using a match.

Regards Wilfred

Duncan wrote:
Had a flat this morning (of course.. it's wet. not really a morning
to ride in in Sydney), and one backup tube had an existing leaky
patch.

Anyway..

I had to crack open a new tube of rubber cement to patch the tube, and
its taken me three goes to get the two patches to adhere properly (not
leak). I've never had this problem before.. usually get them fixed
first go.

I suspect my latest tube of el-cheapo rubber cement that came in a no-
name patch kit. It certainly doesn't smell as toxic as the stuff
usually does.

Anyone else had this problem before? Am I just imagining things?

(looking forward to the ride home in 30kn winds and driving rain.. not)

John Henderson wrote:

Vulcanising patches have gone the way of the dinosaurs. They
don't work on modern butyl rubber compounds.

Also tended to leave a lumpy patch in your wheel. Worked great on
thronproof tubes though.

Wilfred wrote:

I haven't seen them in years. 20 at least. Can you still get them?
I never could get them to burn without using a match.

I always used a match on mine. My last half dozen I burnt up, or tried
to a few years ago. They had some interesting crystal growth on them.

Have you tried auto shops recently? I always used the asuto version on
my thornproof tubes. The little bicycle ones were crap.