[C320-list] Prop paint

[Beverly Wright]

Is the zinc-rich primer you're talking about the same as Pettit Transducer
Antifouling Paint
<https://www.google.com/search?q=Pettit+Transducer+Paint&ie=utf-8&oe=utf-8#q
=Pettit+Transducer+Paint&tbm=shop&spd=8914958234296170687> ?  This is what
another Catalina owner recommended several years ago to us and it's worked
well - scrape/sand the prop to clean bare metal and spray 2 coats, quick
dry.  $23 online (Wholesale Marine) or $32 at West Marine.

 

Description from website:  Transducer Paint 1793 is for use only on plastic
transducer housings and bare metals including steel, stainless steel, cast
iron, copper, bronze, galvanized steel and lead. It forms an excellent
adhesive bond to underwater plastic housings and metals, and inhibits
corrosion on these surfaces. Transducer Paints smooth, hard surface will
self -clean in service, and can be used above or below the waterline. The
dried film of Transducer Paint contains 93% pure zinc. Superior transducer
and underwater metal protection. Excellent adhesion to clean metals and
plastic transducer housings 93% pure zinc in the dried film. Fast dry
formula in an easy to use aerosol spray can.

 

Bev Wright

Whoosh #15

Herrington Harbour North, Deale, MD

 

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of Warren Updike
Sent: Friday, March 11, 2016 7:04 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Prop paint

 

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>
mailto:surprise at thompson87.com]

Sent: Thursday, March 10, 2016 8:47 AM

To:  <mailto:C320-List at Catalina320.com> 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

 

 <http://www.reidmiddleton.com> www.reidmiddleton.com

 

On Mar 9, 2016, at 11:15 AM, Scott Thompson <
<mailto:surprise at thompson87.com> 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