DAP DryDex® Spackling provides a unique dry time color indicator that verifies when the patched Surface is dry and ready to be sanded and painted, thus providing a smoother finished Surface in. a shortened amount of time. DAP DryDex® Spackling may be used to fill holes and cracks in. surfaces such as drywall, plaster, wood, brick and stone. Its ready-to-use formula spreads easily for fast, Professional repairs that will not crack, crumble or flake.