The Ultegra cable sheaths work great, I've had no issues with mine for 2 years. You must wipe down the frame with IPA just before applying though. It's the only way to get good adhesion.
Weird, I tried them on the fork of my Bob Jackson and I’ve had to replace it 3 times in 3 years. It might be that they’re following a curve? But it always starts peeling at the bottom and works it’s way up.
It doesn’t hold al well as you’d like it to.