An undercoating never hurts. Loose Joints or Carving Loose joints and carvings must be reglued. Fresh glue will not stick well to dried glue, you must clean the old glue off all surfaces before regluing. You may use any of the commercial wood glues available at your local hardware store. Finally to get a really good bond the glue must dry under pressure.
Clamps work very well.
Warped Doors and Drawers Warping is usually caused from moisture. On a sunny day wet an area of grass. Place the hollow or concave side down on the wet grass and wait a few hours or a few sunny days. If one end or corner is warped more than the other, you must weight it down with a heavy object. When the board looks straight, take it inside and let it stand in even temperature for a few days.