I'll be washing and sealing my deck in the near future and want to seal it. Its about 5 years old and has never been sealed. It's darkened with age from a large tree directly over it but pressure washing does clean it up so that will be done first. I do not want a paint product, I want a sealer and possible stain for a maple color. I see some decks that look painted, I don't want that, What's the best product for this and for new wood fencing, all pressure treated?