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Neil,
I work in the aviation industry and work with composites on a regular basis. When it comes down to it, I end up using West System w/slow hardener as my "go to" repair epoxy. It is easy to work with, reliable, trouble free and produces a quality part or repair. Even by hand, without vacuum bagging.
You could easily go crazy and choose super expensive Hysol products, and not get better results.
Interestingly, a simple "2 core 2" panel of carbon fiber and West Sys (2 layers carbon each side of the core) uses very little epoxy and is amazingly strong. Good enough for high end aerobatic aircraft that regularly see 10G's.
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