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Yes. It will probably take several coats. Put a coat on cut it back, put a coat on cut it back. Repeat until filled. There are just too many ways to do it to list here.
In my gunsmithing days I...

Black walnut has a very open grain. Consider filling the wood before the final finish next time. If you can see shiny pits in the finish the grain is not filled. You can use the finish to fill the...