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Nagging question: is "vulcanizing fluid" just plain old rubber cement?

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Nagging question: is "vulcanizing fluid" just plain old rubber cement?

Old 11-05-18, 02:00 PM
  #76  
datlas 
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Originally Posted by cthenn View Post
3 pages on rubber cement, TLDR, but I use Slime rubber cement. Came in one of those "standard size rubber cement" canisters, and cost me like $8. I'm sure it will dry up before I use it all, but the times I've used it, it's worked perfectly. Important part is getting the legitimate Rema patches though.
But is rubber cement the same as vulcanizing fluid?
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Old 11-05-18, 05:06 PM
  #77  
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Originally Posted by nycphotography View Post
I have run out of patches. Where can I get "quality patches in bulk"??

(Seriously, I am ready to order asap, as I need to glue one inside a tubeless tire that won't seal).
You can get a box of 100 Rema patches for less than US$20:

https://www.amazon.com/Rema-25mm-Round-Patches-100/dp/B0017RV5K4/ref=mp_s_a_1_1/135-9705877-8216945?ie=UTF8&qid=1541459081&sr=8-1&pi=AC_SX236_SY340_QL65&keywords=rema+tire+patch&dpPl=1&dpID=61zJxEIZkmL&ref=plSrch
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Old 11-05-18, 05:22 PM
  #78  
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Originally Posted by datlas View Post
But is rubber cement the same as vulcanizing fluid?
Iowknow....all I know is it works sealing inner tube punctures!
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Old 11-05-18, 05:32 PM
  #79  
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I find the 25 mm patches too big for most road tubes, so I use the 16 mm jobs:

https://www.amazon.com/Rema-F0-P-16m.../dp/B001S36CNC

Originally Posted by JohnDThompson View Post
You can get a box of 100 Rema patches for less than US$20:

https://www.amazon.com/Rema-25mm-Rou...kmL&ref=plSrch
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Old 11-05-18, 05:40 PM
  #80  
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vulcanizing glue is not the same as rubber cement.
The reason you see some patch kits w/ glue say "rubber cement" is the same reason this exists:


vulcanizing cement works with the backside of the patch to chemically bond to the innertube
rubber cement is just an adhesive
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Old 11-05-18, 08:47 PM
  #81  
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I loaned out a bike & it got a big staple in the tubular tire.

The little patch kit glue tube was partly gone off, & one of the patches (staple went all the way through the tube) didn't hold.

Redid it with contact cement, which worked well.


Apparently, the above sign means "keep off the grass".
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Old 11-06-18, 06:37 AM
  #82  
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"I like your smile (I bet you do from down there!!) but don't like when you step on my face" = keep off the grass with some chinese humor. I imagine some of those symbols may have some interesting double meanings.
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Old 11-06-18, 10:37 AM
  #83  
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Could you please run a test using just inner tube for a patch?

I bought a bag of little tubes of glue from China some years ago
but the patches failed. No one else has suffered this fate so
perhaps it was just an outlier.
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Old 10-13-19, 01:47 AM
  #84  
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Originally Posted by DannoXYZ View Post
Quick glance through ingredients shows:

Elmer's No-Wrinkle Rubber Cement
>70% Heptane
20-25% natural latex rubber
1-5% Isopropol alcohol

Rema Vulcanizing Fluid
60-95% Naphtha, petroleum, hydrotreated light
1-2.5% N-Ethylcyclohexylamine

other brands also contains: acetone, heptane, trichlorethylene, zinc-dibutyl dithiocarbamate/dibutylamine

Now we can see that the office-stationary "rubber cement" is clearly of different composition than "vulcanizing fluid" regardless of how it's labeled. Leave a bottle of rubber-cement open and you end up with a ball of rubber about 25% the size of the container. Leave a bottle of vulcanizing fluid open and it evaporates to nothing; very different stuff. The N-Ethylcyclohexylamine is a vulcanizing accelerator/catalyst which speeds up vulcanizing enough to occur at room-temperature (heat does the same thing). Ever see "RTV" on various rubber-sealants like caulk? The red uncured rubber on the patches provides the sulfur and in the old days with skinwall tyres, you can see a brown circle appearing on your tyre if you install the patched tube right away. This is caused by the release of various gases during the curing process.

A lot has changed in the past 20-30 years. Just because there was only one way to vulcanize rubber 30-years ago, doesn't mean that technology hasn't improved. Look at how materials technology has improved in frame materials, and how mechanical engineering designs created index shifting. Auto and computer technology has improved significantly in the past 30-years.

In the end, it's not an all-or-nothing, black & white, yes/no issue on patches. It comes down to a shades-of-grey on how well various compounds holds a patch to a tube. I'll do a demo video of "rubber cement" versus "vulcanizing fluid" after 24-hrs curing and show how easy or difficult it is to pull off a patch using both these products.

You can get 8oz Slime rubber cement can for $6 at Pep Boys (more than twice expensive $15 on Ebay)

https://www.pepboys.com/slime-rubber...478?quantity=1 ]


via https://cdn.shopify.com/s/files/1/22..._-_NA.pdf?1202

3 Composition/information on ingredients ·

Chemical characterization:

Mixtures · Components:

8032-32-4 Ligroine 40-60%

9003-35-4 Formaldehyde, oligomeric reaction products with phenol 10-20%

586-62-9 Terpinolene Asp. < 10%
The chemicals don't match the ones for Rema (see above, in BOLD RED)

Someone correctly pointed out, it's better to match REMA vulcanizing fluid with REMA patches (which I like, you can get 100 pack for $16 from Ebay)


I've used Elmer's Rubber Cement with varying success with REMA patches. Sometimes they seal, sometimes they don't

See also this other thread:

https://www.bikeforums.net/bicycle-m...-cement-4.html

Last edited by chimpanzee; 10-13-19 at 01:59 AM.
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Old 10-14-19, 09:43 AM
  #85  
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" on 16mm Rema patches for almost all road tube repairs, also " on the 100 pack. The next size up are handy for mountain tubes and bigger road tubes - just to use the patches, mostly, as 16mm are sufficient for punctures, if not cuts...

I get the smallest tubes of glue to carry with on the road - best not to open/puncture the seal until needed, then carry two tubes of glue, the opened one and a new one as well. I carry a spare inner tube, so hardly ever patch on the road.

The larger tubes of glue stay home.

Try this: before putting your tube of glue away after use, hold it cap side up and carefully squeeze out all the air, such that an arc of liquid is bulging out, then put the lil' lid on there - now there's no air in the tube, and you've lost only the solvent that's evaporated whilst the cap was off (an' don't leave the cap off while playing with your patch). Big difference, you'll find, especially if you're never allowing atmosphere to be drawn into the tube of glue in first place - uncap, maintaining pressure, squeeze out your drop, recap. Carry on.
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Old 10-17-19, 04:40 AM
  #86  
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Originally Posted by chimpanzee View Post




You can get 8oz Slime rubber cement can for $6 at Pep Boys (more than twice expensive $15 on Ebay)

https://www.pepboys.com/slime-rubber...478?quantity=1 ]


via https://cdn.shopify.com/s/files/1/22..._-_NA.pdf?1202



The chemicals don't match the ones for Rema (see above, in BOLD RED)

Someone correctly pointed out, it's better to match REMA vulcanizing fluid with REMA patches (which I like, you can get 100 pack for $16 from Ebay)


I've used Elmer's Rubber Cement with varying success with REMA patches. Sometimes they seal, sometimes they don't

See also this other thread:

https://www.bikeforums.net/bicycle-m...-cement-4.html
I just bought 8oz Slime rubber-cement (has an activator element, plus solvent) from Autozone for $6, designed for car tire repair.

[ Can also be obtained from Pep Boys for $5.36 (20% sale), or Walmart for $5.97 ]

The patch with Elmer's rubber-cement failed for a 700c tube. I cleaned it up, & used Slime rubber cement. The instructions made no mention of allowing it to completely dry (as in REMA vulcanizing vluid), so I applied the (used) patch with cement still wet (I did allow it to dry somewhat). It seems to work..!!

I returned the Elmer's Glue to Office Depot.

I've had car tire repairs, using a patch. The tire guy used a grinder to clean the roughen the tire, applied glue (Slime, Xtra Seal, whatever..), applied patch, then used a pizza-cutter type of tool to press it in.

Last edited by chimpanzee; 10-17-19 at 04:47 AM.
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Old 10-17-19, 12:11 PM
  #87  
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Just got back from the local farmer's supply store and yes, they have Rema (And other brands) patch kit for sale. Tractor size...I guess you could cut them down or sell off the extra. No, I'm not a Farmer but they do have good prices on a lot things.
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Old 10-18-19, 12:49 PM
  #88  
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This post was interesting.
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