Why cant I use DWD on reeded decking?
DWD needs to be applied as a thick even coat. The reeded side, or grooved side, does not allow the DWD to be applied evenly, and therefore the protective, thick even coat is not achieved. The coating flows away from the peaks into the troughs, resulting in a coating that is thinner than recommended and therefore has a shorter lifespan. DWD should only be used on smooth, unreeded decks.