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Is Epoxy Carbon Safe?

Posted: Fri Jan 18, 2019 9:27 am
by JScycle
Hey All,
My fender mount has pulled out of my carbon frame. Can I epoxy it back in place safely?

Is Epoxy Carbon Safe?

Posted: Fri Jan 18, 2019 9:27 am
by Weenie

Re: Is Epoxy Carbon Safe?

Posted: Fri Jan 18, 2019 9:47 am
by mattr
Where has it pulled out, what damage has it done to the underlying tube?

Re: Is Epoxy Carbon Safe?

Posted: Sat Jan 19, 2019 1:56 am
by JScycle
mattr wrote:
Fri Jan 18, 2019 9:47 am
Where has it pulled out, what damage has it done to the underlying tube?
Hey. Attached are two photos. One is the mount pushed all the way in/normal the other photo is the mount pulled out as far as it will slip. Basically I can still use the fender it is just wobbly.

Image

Image

Re: Is Epoxy Carbon Safe?

Posted: Sat Jan 19, 2019 8:34 am
by mattr
By the looks of that, I'd just run a bead of epoxy round the gap, and push the boss back into place. Leave to cure. Might need to strip stuff down a bit so you can get proper access. And hold it in place with some tape while it cures.

I was expecting some sort of great big ragged hole with torn CF everywhere!

Re: Is Epoxy Carbon Safe?

Posted: Sat Jan 19, 2019 9:10 am
by hambini
If it's a rivnut you could drill it out and put a new one in.

Re: Is Epoxy Carbon Safe?

Posted: Sat Jan 19, 2019 2:39 pm
by wilwil
hambini wrote:
Sat Jan 19, 2019 9:10 am
If it's a rivnut you could drill it out and put a new one in.
This. I had a rivnut go on my Cervelo BB external cable guide. Bought a Rivnut tool and some Rivnuts for about £35 and it was pretty straight forward. I practiced on a bit of scrap metal first. Dont frig about with a home made rivnut tool made from a bolt as seen on You Tube though.

Re: Is Epoxy Carbon Safe?

Posted: Sat Jan 19, 2019 2:39 pm
by Weenie