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Old 04-23-2013
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Re: Using Bottom Paint on Brass Propeller

Originally Posted by Faster View Post
The prop will be bronze, not brass....

While some props are NiBrAl (nibral) most are manganese bronze. The bronze part of manganese bronze is a little misleading because most props contain upwards of 35-40% zinc.. Applying copper bottom paint can destroy them..

This prop was fine for 25 years unpainted. It was painted with a copper bottom paint and in less than one year was dezincified and destroyed.

This manganese bronze prop had also been painted:

This one took the owner over an hour to get all the paint off and only to find out it was totally un-safe for continued use:

Here's another totaled prop due to copper bottom paint:

This one was so dezincified the color was almost uniform. The owner stripped the paint off and a few months later threw a blade:
-Maine Sail / CS-36T

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