Step 1: Orbital sander to remove the old finish. Use sandpaper coarse to fine. 120 grit, 240 grit, 320 grit, 400 grit.
Step 2: Use a plastering tool to coat the tabletop with jointing compound. Sand it off with 400 grit. Do it twice if the tabletop is rough. The compound will fill defects and grain to make a smoother finish. Not to worry, the stain and varnish will penetrate it and make it invisible. Don't listen to GJ members who claim "You can't do this because it's never been done before!"
Step 3: Stain per manufacturers recommendations.
Step 4: Varnish per manufacturers recommendations. Usually 2 or 3 coats brushed VERY thinly. You may lightly sand with 400 grit between coats.
