wood bulkhead door - How to Waterproof?
Not sure you can make it completely waterproof short of encasing it in fiberglass or something. Diligence and application of quality exterior paints or stains on a regular basis should protect it. You might look into a marine finish for some added protection.
What is it made of now and does it need to be replaced? You might use something like cedar or redwood that is better suited to outdoor exposure on a bulkhead like surface. Make sure water is not allowed to pool on the surface or saturate its framing.
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