Certainly, your prop is not made of brass. Brass will fail pretty quickly in salt water. Your prop is bronze, nibral or another alloy.
As for "thinning". when I had my boat surveyed in 2008, the surveyor noted that my prop was thinning due to electrolysis (not being polished too often in a boatyard). I have put nearly 3,000 hours on it since then with no ill effects.
As for "thinning". when I had my boat surveyed in 2008, the surveyor noted that my prop was thinning due to electrolysis (not being polished too often in a boatyard). I have put nearly 3,000 hours on it since then with no ill effects.