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Old 01-08-2007
k1vsk k1vsk is offline
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The gray is more than likley Petit Zinc Coat Barrier Primer. It is used, as it's name implies, as a primer under copper based bottom paint, on metal surfaces such as props to minimize the potential for galvanic corrosion caused by the copper paint in contact with the bronze prop.
If you are going to repaint the prop, make sure you use it or something similar.
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