dhays
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Guess I'm a bit confused. What is the bolt in there for? Typically, you would seal up the bottom of the hole with duct tape, or some other means and pot the hole up to the top, keep adding as needed until it gels. Then redrill as needed once it's cured. I wouldn't worry too much about amine blush for this sort of thing, it's just potting not a structural feature. If you are concerned about amine blush, switch to MAS epoxies which are amine free, they also have a low viscosity product that will wick well into any core material.
It is a long and old thread so your confusion is understandable.
No acceptable (to my wife) access to the underside of the deck. I wanted to be able to use bolts screwed into the deck to mount the hardware. I considered, and rejected, using a drill and tap method, in favor of the casting method I used. The drill and tap would work fine, but when testing I found that I was able to get more consistent results with the casting method. Likely just my poor technique.