Paver saver

Can anyone tell me anything about Defy and the epoxy fortified sealers? I have been strictly a concrete sealer guy and have had far and away the best success with Techni-seal, but they do not make anything for wood. I am sure wood sealers are like concrete, that there are many names but very few good ones. I am interested in the Defy sealers, but wonder if I am just suckered by the ads. Are they any good or is something better. I currently need to do a deck about 18 months old, never sealed, customer likes the look of the existing wood, wants a clear unless that is really a bad idea. any thoughts are greatly appreciated.

Ok, I just checked, the cleaners used was a cleaner/brightener with the acid you mentioned. It was cleaned to weeks ago, Do I need to clean again? I am fighting falling temps here and not sure if I use another day to clean it, that I will get warm enough to get it sealed. So if was cleaned and brightened two weeks ago, can I just seal it with the ready seal?

OK, you people are the best. Again bear with me, I am a concrete guy........we're slower. Anyway, cleaned this deck 2 weeks ago with Behrs( I know) cleaner. I am going to use RS. Do i need to clean again, or neutralize? is so with what?

Thanks for all your info.... OK Defy is out. Now I have narrowed it down to Wood tux and ready seal ( I think) which would you suggest on the following deck: 18 months old, never sealed, Ohio valley, Heavily shaded( trees built into the deck) pt pine, wood is clean and bright, home owner likes look of exisiting wood or is afraid of change, not sure. So currently looking at the lightest stain I can get away with while still have some uv....... so what do you suggest WTW or RS or something else? Thanks