Re: Deck restore on new wood bed
The trouble with any coating, such as a polyurethane, when the wood expands and contracts, along with the sun's affects, it will always eventually crack, lift, peal, etc. The better products will last longer but the end result will always be the same.
Sealing with your choice of an oil or preservative like the others have suggested is your best bet IMO. You will have to occasionally reapply it but it's a whole lot easier than stripping and reapplying a coating. An hour spent twice a year is all it would take to reseal.
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