In response to Deck Rejuvenations sanding techniques other companies that employ "wet chemical" techniques have added in a final sanding step. This may look like it fixes the damage but in reality it is merely fixing the surface and fixing it temporarily at that. The aggressive hydroxide based liquid that soaks in to the wood can't be rinsed. A simple litmus paper test will reveal that the pH is no longer 7 even after excessive rinsing a day later when re-wetted. The Caustic low pH components darken wood and degrade your new finish from the inside out. Acidic Brighteners are supposed to neutralize the hydroxide based stain removing chemicals but how do you neutralize what has soaked in on the first step? I can see decks treated by these methods in their past develop undercut rotting at the board ends. This is because the deceased xylem cell walls, or "water blood vessels", still exist in the lumber. These serve as an excellent pipeline to transport water from the roots to the leaves. Unfortunately these also serve as an excellent pipeline for NaOH or KOH which are the main caustic ingredients in stain removers. I have taken thousands of boards to be recycled that seemed in relatively new shape except for undercut rot in the last two to four inches. This seems to me like a waste of our precious NW Cedar.
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