I've tied a ton of flies with CCG and have had no issues whatsoever. It comes in tack-free versions and has no issues with yellowing or fracturing when your backcast sends it into hard surfaces such as rocks. When a pressure line in my car sprung a leak last winter, I used CCG to patch the hole, and it held no problem. When the chock that holds my driver's side window to the track that guides it up and down broke over the summer, I used CCG to fix it. In each case the CCG underwent extreme temperature fluctuations and didn't fail. The stuff is bombproof, and will never lose clarity. Great product, great company, great service. And I don't get anything for saying all that.
I never said that CCG was not strong or its yellows after time.
Before I started using Loon Uv, I would use CCG to patch a seem on my float tube. After about 12 hours on the water I would have to do it again. While camping I meet group of fly fisherman from New York they recommended to try Loon UV Wader Repair. After about 30 + hours with Loon I have yet to reapply.