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If the wood is old and gray, he might try bleaching it with oxygen bleach. That will restore the new wood color, they say. That could make it easier to match if he finds he needs to replace some pieces.

The best known deck sealer is probably Thompson's Water Seal, but it is reportedly not a very good coating. It does not last long. So retreatment every few years is necessary.

There probably are better sealers out there. There certainly is better wood protection technology.
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