We have a five year old in-ground pool with a stamped concrete pool deck. The pool builder applied a sealant to the deck that looks to be completely gone. I'm wondering if I need to re-seal. Would not re-sealing it significantly shorten the life of the deck? I know the sealant provides a shiny look but neither my wife nor I feel we need to have that look. So this is strictly about functionality and longevity. We live in Massachusetts and the pool is in sunshine most of the day. We get four full seasons here with all the freeze/thaw cycles that accompany winter.