Any clear (non-tint) coating will be suitable and enhance the timber grain. We suggest Cabots Cabothane Clear, Wattyl Estapol or Haymes Aquatic Floor or Resene Aquaclear coating. Alternatively consider OSMO Wood Wax Finish for a clear yet richer tone. Please refer to Section 10 of the Porta Contours Install Guide to Lining Board Range for more information.