I used a caulk gun to inject the West System filler into the cavity through all the holes that were big enough, until it started oozing out the smaller holes, then I smoothed it with a spreader. I went through about 4 tubes of it; each tube was 10 squirts of resin, 10 squirts of hardener, and about 3 cups of colloidal silica filler, to make it the consistency of toothpaste. They say you can reuse the tubes. I did that once but it was a lot easier to use a new tube every time. The 206 hardener gave me enough working time (~90 minutes) to repeat the mixing process several times while the applied filler was still workable.
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