Agreed it's difficult stuff. I filled the large voids with black epoxy and all the small ones with super glue. I still have at least one or two more passes on the entire top with more super glue, leveling with a rubber squeegee, then sanding smooth. After I'm certain it's soaked up all it can, I'll move to sanding sealer, then a lacquer finish. I'll probably order the finishing kit from Stew Mac.
Mahogany back and sides will get grain filled and sealed then sprayed with gloss black lacquer.