Here's a quick and very effective method for filling wood grain, or filling around Finger Joints, Box Joints, Dovetail Joints or any other kind of joint that doesn't fix exactly perfect. All you need for this method is some Polyurethane and some sandpaper. We're going to apply some poly to the joint and sand the poly into the wood. This creates a slurry of Sawdust and Polyurethane. After a little while, the joints should be filled in and much less noticeable. (10/2019) --- Affiliate Links to Pro