Wash the wood with soap and water and allow it to dry completely.
Sand the entire surface of the wood along the grain with a sander and 250-grit sandpaper to make it smooth. Hand-sand corners, edges and other areas difficult to reach with the sander.
Vacuum the wood to eliminate the dust and debris from sanding.
Apply water seal evenly over the entire surface of the wood using a paintbrush, roller or sprayer. Allow the seal to dry thoroughly.
Apply wood stain to the wood with a paint brush, if desired.
Wait two days before walking, sitting on or otherwise using the wood.