Most rot damage on trim is cause by moisture being sucked up into any unpainted exposed endgrain. I always keep paint handy to seal the endgrains up good before I install any trim. These are usually in places a painter cant get to after installation. In this I case I painted the top and bottom endgrains of my ballisters before assembling my railings. Even though they wont be exposed to the weather, the added coat of paint will be one extra step against future rot damage.
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