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Carbon Repair

manhattanprjkt83

Rusty Trombone
Jul 10, 2003
9,526
1,077
Nilbog
I could have searched but that would have been way too easy. I have an evil wreckoning I got from a buddy which has a very minor gouge to the carbon (3mm or so) in the middle of the seat stay. Honestly it doesn't look like its even fully through the carbon. I am planning to repair it and use it as my dh bruiser for next season. What have you folks used for carbon repair in the past? I checked w/ a couple of these online places, one guy was a complete asshole about the color I wanted it painted and the other was a bit pricey (1k). I think I can probably do the repair and home respray for around $250, will be a good winter project.

Input?
 

Jm_

sled dog's bollocks
Jan 14, 2002
16,659
7,596
AK
Sheet of 1m or yard about $40, West system epoxy and hardener. Few mixing cups, some paper tarps and PPE.
 

Westy

the teste
Nov 22, 2002
50,133
15,581
Sleazattle
Plenty of good youtube videos on this subject but my $.02. Since you don't know what the layup of the damaged carbon is use a woven fabric and rotate 45 degrees between layers. Sand the damaged part to remove everything broken and create a smooth transition. Taper your repair so you just don't cause a stress riser at the edge of it. I'd put the smaller layers of fabric on first then go bigger beyond that. I'd recommend trying to get your hands on shrink release tape to make sure you have good saturation, no bubbles and not too much epoxy.



Even better if you can get your hands on some peel ply but a good poor man's method is to just use electrical tape with the adhesive side out.

Since you will have 10X the materials you need for this repair practice a bunch on a wooden dowel or something similar in shape to the tube you want to repair.

Mix two batches of expoxy, wet out the fabric on some wax paper and let it tack up a bit before you apply, small bits of fabric like to come unwoven unless something holds it together a bit. Use a fresher batch of epoxy to further wet out when you apply it to the frame.
 
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manhattanprjkt83

Rusty Trombone
Jul 10, 2003
9,526
1,077
Nilbog
Plenty of good youtube videos on this subject but my $.02. Since you don't know what the layup of the damaged carbon is use a woven fabric and rotate 45 degrees between layers. Sand the damaged part to remove everything broken and create a smooth transition. Taper your repair so you just don't cause a stress riser at the edge of it. I'd put the smaller layers of fabric on first then go bigger beyond that. I'd recommend trying to get your hands on shrink release tape to make sure you have good saturation, no bubbles and not too much epoxy.



Even better if you can get your hands on some peel ply but a good poor man's method is to just use electrical tape with the adhesive side out.

Since you will have 10X the materials you need for this repair practice a bunch on a wooden dowel or something similar in shape to the tube you want to repair.

Mix two batches of expoxy, wet out the fabric on some wax paper and let it tack up a bit before you apply, small bits of fabric like to come unwoven unless something holds it together a bit. Use a fresher batch of epoxy to further wet out when you apply it to the frame.

I really appreciate this man, that's why I love RM to this day. Thanks for putting so much detail behind this. I'll post pics of my progress.
 

buckoW

Turbo Monkey
Mar 1, 2007
3,357
3,763
Champery, Switzerland
What @Westy said and pay attention to the tapered layers he suggests.

https://www.easycomposites.co.uk/carbon-fibre-rapid-repair-kit

https://www.easycomposites.co.uk/fishing-pole-repair-kit

I‘ve had good experiences with their epoxies, breather cloth and peel ply. Their epoxy is much nicer to work with than something like the West Systems 102 and it’s much stronger. Sicomin is my favorite these days. When doing snowboard layups the quality of the epoxy makes everything nicer. The Greenpoxy 56 works just like a normal epoxy fyi.

http://sicomin.com/