[C320-list] Prop paint

[Warren Updike]

Several years our boat group, Northern Chesapeake Cruising Club (NC3)
nc3sailing.org, did a study of prop preps. At the end of the year we
compared results and found that zinc rich primer performed the best. You can
pay $20 for boat products, or go to a home store and pay $7 for a 90% zinc
primer in a spray can. Prep is important. Get the prop and shaft clean, etch
with mild acid, apply many light coats. 
Anyone have better ideas on prep?
Haven't done the Lanocote thing but sounds interesting.

Warren and Pattie Updike
1994 C320 "Warr de Mar" #62
Middle River, Chesapeake Bay

-----Original Message-----
From: Scott Thompson [mailto:surprise at thompson87.com] 
Sent: Thursday, March 10, 2016 8:47 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Prop paint

This sounds like a possible solution for me. Do any Chesapeake sailors 
have experience with this approach? Pacific waters tend to be colder and 
saltier than what I experience in Maryland, so results could differ also.

Scott

On 3/9/2016 5:18 PM, Utility Email wrote:
> Both in SD and in the PNW we coat our cleaned bronze prop and parts of our
stainless steel propellor shaft with the Petit Zinc-Rich paint. Then I coat
the propellor with Lanocote as a further precaution.  So far over the last 5
years of using this system, it has kept barnacles off on these parts.  I
check it every 6 months with new zincs and that system works well.
>
> Years ago I looked into Propspeed, but I was put off by the cost and the
extensive prep work and application process for its installation.
>
> So clean the prop and shaft really well, coat the prop with multiple coats
of the zinc rich primer, then coat the prop just before entering the water
with Lanocote.
>
> Dave
>
> David B. Swanson, P.E., S.E.
> Principal, LEED AP, F. SEI
> Director, Structural Group
>
> Reid Middleton, Inc.
> (425) 741-3800 office
> (425) 741-5011 direct
> (425) 508-7971 mobile
>
> www.reidmiddleton.com
>
>> On Mar 9, 2016, at 11:15 AM, Scott Thompson <surprise at thompson87.com>
wrote:
>>
>> Does anyone have specific suggestions for an alternative to PropSpeed
that works well on the Chesapeake Bay?
>>
>> I've been using PropSpeed on my prop the last few years and am not very
happy with the results. We tend to not use our boat much during latter part
of July and August, and inevitably the warm waters of the Chesapeake Bay
encrust the prop during this period. Scraping the prop then takes off the
expensive PropSpeed. Plus two years ago I nicked a finger while scraping the
prop and got a bacterial infection that eventually required surgery and
months of antibiotic treatment. My doctor tells me to not go under the boat
any more.
>>
>> So I'm looking for an alternative. Obviously frequent cleaning by a diver
is one solution, except that we keep the boat on a mooring so this is hard
to arrange.
>>
>> Scott Thompson
>> Surprise, #653
>>