These situations point out with emphasis the statement regarding coat everything you don't want to stick with release agent! I always put 2 coats--everywhere on the action and at least 4" further up the barrel than I intend to put the epoxy. I've only done about 100, but knock on wood, with abundant use of release agent, no problems. I find the gell much more user friendly than the liquid. No "dams" for one thing. It pretty much stays where you put it, doesn't run to where not wanted. Good luck!
A couple of other points of real importance: Be careful about using the prescribed ratios in the mix. It doesn't take much variation from the prescribed to make up a goo that won't set, and that leads to a real hassle!
Also, mix for at least the specified time! Use a timer of some sort. An awful lot of folks find that the 5 minutes that they thought they mixed was really only 3 when they start actually timing the process. It can have a real negative effect!