This is where being a hobbyist is fun. I do pore-filling using pumice/rottenstone and shellac. It's far too slow for production work but it produces a beautiful surface, albeit at the expense of a lot of time and work.
I've done CA filling once, when I just couldn't get the pores to fill on some padauk with enormous, drive-a-truck-through-them pores. I used a rubber spatula and did not leave much on the surface, and sanded back. A lot of it soaked through to the inside; the guitar's interior is blotchy because of it. But it did work where pumice and shellac were just too labor-intensive.
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