For deeper burns, fill with a mixture of wood glue and sanding dust. Put the mixture in, let cure, smooth with a razor blade. Dents are the results of wood fibers being crushed and compressed. To raise a dent, simply swell the fibers back up with moisture in the form of steam. Place a damp cloth over the dent and hold a medium-hot iron on it.
Check progress frequently.
When veneer begins to stick, apply pressure until glue dries. If no sticking occurs, regluing is needed. For a good bond, clean away any dirt and old glue before applying new. Wood warps when moisture loss on one side is greater than on the other. To straighten a warp, add moisture to the dried-out side.