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The acid rain here is (we think) the worst in the world - just one rain shower can have the boat looking zebra striped.
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If the black is not removed quickly, it will eat into older gel coat and paint systems to become a permanent feature of the vessel.
Our Awlgrip paint is five years old, but living in Manila for the past year we were simply not washing the boat often enough. So we returned to a stripy hull and decks that resisted all attempts at conventional cleaning.
We really needed a solution.