I have antique wide-pine floors that have been beaten over the years. I'd like to re-finish them, but fear that there is not enough wood to really sand them down. It's been recommended that we paint them after sanding them lightly, but my wife is against that (read: I need a plan B). Is there any product that we can apply to the floors that will renew the color, but without covering them grain completely? I've been told that there are stains that contain polyurethane, but I'm not completely sure if they exist or if this is the right application.