In my humble opinion the less you do to the feet of a guide, to a achieve the desired outcome the better.
I've had guides crack for no aparent reason, even after a minimum amount of interference. about 12 months back I lost a guide on it's first outing...as far as I was concerned it was a fault or defect in the metal or manufacture.
So I'm of the opinion that a certain percentage will break anyway, regardless.
I'm also of the opinion that a firmly bound guide will endure less stress due to less movement regardless of how small that may be.
As for resin, I've used Erskines for years, I have it on rods that were built well over ten years ago and it's still looking OK. BUT... you get what you pay for, having used flex coat, I would find it hard to change back.
It's a much user friendly product and gives very nice clear finish. I invest a lot of time and effort in my cross wraps, so you can imagine I would want to show them off in their best light, and I get that with flex coat. There are a few other products out there that could well be better, but I've yet to try them.
good luck
roz.