Rebonding carbon saddle rails

[brearley]

I have a full carbon saddle which had been replaced under warranty but I'd like to repair this also.
Front edge became unbonded and eventually one of the rear corners came unglued also so I pulled the 3rd corner off to fully remove.

I have access to vacuum pumps, bags, epoxy etc what prep should I be doing before applying epoxy then pressure so that it doesn't unbond again?
I've previously tried Araldite on the front edge which worked for a while

Has anybody done this with a guide to doing so that'd be ideal