Originally Posted by
velomateo
Glad to hear so many have had good luck with their bonded frames, but I would recommend caution when buying/riding these frames. I purchased an old Vitus Carbon fiber bonded frame some time ago. I purchased it for the groupset really, but while checking the frame once I removed all the components, I was amazed to find I was able to pull the frame apart with my bare hands with not much force at all. Not saying they will all fail, but that glue from the 90's isn't going to last forever, especially if your bike lives in a harsh climate.
Check out this video from youtuber Bike-it.
https://youtu.be/2k6OsRGAADo?si=0JoGpmTMlrXg-fO6
That's the video I mentioned.
I'm pretty sure the failure was due to the heat applied to the frame during the paint job. No matter which glue is used, aerospace quality or not, heat will cause it to fail.
Not talking ambient, but excessive or extended.
No matter what, it's prudent to think about these things.