Something to consider:

Synthetic sealants effectively 'seal' the wood and don't allow it to breath. A proper oli finish does need a spot of oil rubbed in after a lot of rain but is harder wearing than many give it credit for.

You cannot stop moisture getting into the wood - it will get in!

Allowing it to get out evenly and gradyually through a proper oil finish gives it beter recovery time and the finish will go back with very little efort. Also, scratches and dents are easily dealt with.

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