Always sand between coats of varnish, for two reasons. You must roughen the first coat so the second one can adhere to it, and you want to knock off any dust bumps or other imperfections. Use a sanding block and 4/0 (400 grit) sandpaper and sand the surface until all the gloss is gone. (The first time you varnish, this will prove painful. First, you admire the glossy finish you have just made, but then you must destroy it. Don't worry; this method works.)
There may be glossy areas remaining after you have sanded with the block. Use very fine steel wool to degloss them. After sanding, wipe the surface with the tack rag to remove all residue.
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