The curing of epoxy in a deep hole can be problematic. Any hole much larger than 1/2" wide will be prone to cracking, which I forgot to mention.
The way to defeat this issue is to do two shots of epoxy; one is a partial and the next one; maybe half the gel time of the first added second. Or, you can run some compressed air on the area and keep it cooler that way. All depends on how fat the glob inside becomes....
For West Six10, you probably shoot part of it and toss the applicator and at 20 minutes fill the rest or something like that...then the second shot is curing later than the first, but will still be homogenous..