I have had similar problems accompanied by slower speed and even overheating 
issues when the buildup gets too much before I had her hauled last year.

I am working toward a wetsuit/hookah set up to dive the boat periodically to 
clean the prop and shaft.

When she was hauled last July I cleaned the Maxprop and shaft and than applied 
the Petit spray paint product for transducers and props.  

I got a look at the prop at the end of the season via a friend's GoPro and it 
was still clean.  No idea what it's like now, but I had get out a few weeks ago 
and the speed was about the same as at the end of the season.  So, that's 
promising.

As for your mystery, no idea.

Tom B

Typoed from my iPhone

Tom Buscaglia
Alera 1990 C&C 37+/40
Vashon Island WA
O 206.463.9200
C 305.409.3660
Skype - thombusc



> On May 7, 2017, at 12:38 PM, cnc-list-requ...@cnc-list.com wrote:
> 
> Message: 6
> Date: Sun, 7 May 2017 15:28:48 -0400
> From: David Knecht <davidakne...@gmail.com>
> To: CnC CnC discussion list <CnC-List@cnc-list.com>
> Subject: Stus-List Prop "treatment"
> Message-ID: <cc208223-f867-4d11-b1d4-d4eb05200...@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> I have struggled with how to deal with my prop and have tried a number of 
> suggested solutions over the years. None have been totally satisfying in 
> terms of keeping it clean for the season. Propspeed last year was the best so 
> far.  I was sanding yesterday and the guy with the boat next to me looks over 
> and says he has some advice.  He said that many years ago, he sanded his prop 
> clean and put the boat in the water with no further treatment.  He has not 
> touched it in the years since and claims he never gets barnacles.  The prop 
> now has a very rough texture to the metal and looks nothing like brass.  It 
> looks like it is coated with something and I have never seen anything like 
> it.  Anyone know what is going on?  Dave
> 
> 
> Aries
> 1990 C&C 34+
> New London, CT


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