Cuprinol
I used the above brand name with great luck. Pine docks are 30+ years old. Prior to that my dad uses Creosote coated wood that have lasts 50+ years.
Creosote are banned currently, and Cuprinol can only be applied when the dock is out of the water. Cuprinol is a solid green stain so not to many people care for the color, it does an excellent job preserving the wood!
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