I think it could be done. Are you looking for a ‘pure’ silver/pewter or an antiqued look? Metallic paint almost never looks like the real thing, so I’d suggest antiquing over the paint. You can do this with watered down black paint, or special antiquing gel from a crafts store. Just apply it sparingly (I like a damp sea sponge for all over) especially where there are any nooks & crannies or carved details (this may require a small brush), then blot most of it off with a cloth or paper towel. Take it slow, and remember it’s just paint! Another option is to apply silver leafing all over. You could also leave the tables black, but use silver paint to accent the edges or any details or paneling.