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

Quote:
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:
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