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Corrosion on Capping


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That's what I thought it was. It's a galvanic reaction between the copper in the pressure treated wood and the aluminum coil. It won't stop until all the aluminum is gone.

The fix is to replace the aluminum with vinyl or polyurethane post wraps, or place a barrier coating (tar paper works well) between the metals. This of course means that all the rails need to come down.

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