Mike,
Unless you had David Pascoe do yor survey, some guy in pressed chinos tapping the keel isn't going to give you squat on the condition of the keel cavity aka encapsulated ballast. I've gone on ad nauseum about my experience, which was a shocker, with diatribes on the survey person, the cousins Pearson and the farmers who built 338.
I mix epoxy almost exclusively in graduated quart containers. It was a long process filling syringes and injecting on weekends - but I kept a tally pretty well. There were spills and I know I missed a day of counting. I would put the count closer to six gallons of expensive laminating epoxy.
It just kept going in. Come back the next wkend, and it just kept going in.
Epoxy appeared in the sump at one point (was fortunate to have caught it). The matt seal encapsulating the cavity under the cabin sole was not turned down at the end of the lead into the sump by the workers.
This may have been designed, don't know of course, but it did have the benefit of keeping the cavity drained for 40 years - as long as the sump was pumped. When I first drilled drain holes into the hull outside water came out but not much - I thought the cavity wasn't very large, then.
I think it is a good upgrade for the boat. There may be a better method.
Epoxy was pushing water out til the end. This blind method has no prep to it so it is likely the epoxy fill is not sticking to anything. and has little strength since it has no fiber. A method should be developed that would force epoxy with some filler in it (flox) into the cavity under pressure.
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