How to Fix Cracks in Wood Even though you may have tried to use wood without any cracks, splits, holes, or gouges, sometimes you end up with imperfections you didn’t notice or couldn’t avoid. You can fill cracks, scratches, or even slightly mismatched joints with several different products, including wood putty, wax sticks, and shellac sticks. For those dealing with cracked beams and such, the ideal is to address the problem before it starts. Sealing the wood doesn’t work. Eventually, the wood will still lose moisture, which causes it to shrink, resulting in splits and cracks. Broken, cracked or splintered wood can be repaired if care is taken to fit the pieces back together exactly as they came apart. This is important; when wood fibers separate, small pieces can lodge Dribble wood glue into the crack, and set a clamp against the blocks to pull the crack closed. Clean up any excess glue before it dries, but leave the clamp in place for 24 hours. Wood movement and other factors can crack filler that’s been applied too heavily. To minimize the amount of filler in the crack, we glued some wood into the split first, and then smoothed a thin coat of filler over the repaired surface. .