[Public-List] painting prop

[Meinhold, Michael J.]

When the Chesapeake warms up it grows fast enough in 3 weeks to
seriously degrade performance.

 When we purchased #272 we had her out for the survey 19 July and her
prop was clean. We took possession on 10 August and couldn't figure out
why we could only motor 2 knots. It was not the best first voyage for my
family! When we finally got back to the dock I dove and found a good 1/2
inch of barnacles and slime on each side of the prop blades. I scraped
it off and she went 6.3 knots.

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Glennb
Sent: Monday, March 21, 2011 6:12 PM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] painting prop

I am curious as to how fast barnacles or other growth actually builds up
on props?  I haul usually once a year and never have any serious
fouling...although Puget Sound is not a hot bed for marine growth, I
haven't seen people paint props in Hawaii or Cal waters.  Is this a
significant problem in tropical waters around Florida?

thanks
Glenn
SV Dolce, #319

Sent from my iPad

On Mar 21, 2011, at 2:58 PM, Mel Martin <mel.martin at utoronto.ca> wrote:

> Penaten is basically zinc oxide, suspended in an ointment (probably
mostly lanolin-based).
> 
> Years ago (many!) I conducted a series of toxicology tests on the use
of zinc and zinc oxide as an algaecide. The product we were testing was
intended to be a replacement for the high levels of chlorine and bromine
used to control algae growth in swimming pools. Zinc, in both its
elemental form and its oxide was surprisingly effective at killing
blue-green algae (cyanobacter), even at low concentrations. I would not
be at all surprised to find that in the form of Penaten it was effective
at controlling other bio-growth such as fouls propellers.
> 
> Maybe the fisherfolk are onto something. I can imagine West Marine
marketing a twenty-five dollar tin of baby bum ointment as  the latest,
high tech anti-fouling agent for props.
> 
> mel
> hull # 452 - renamed Sadhu
> 
> PS my four babies' bottoms all benefited from Penaten to control
diaper rash - 'course, that was in the days before disposable diapers ;)
> 
> 
> Message: 1
> Date: Sun, 20 Mar 2011 22:19:16 -0700
> From: Debra Fontaine <debrafontaine at live.com>
> To: public-list at lists.alberg30.org
> Subject: [Public-List] painting prop
> Message-ID: <BLU0-SMTP8585761F2CBA76C5334E9CC3B50 at phx.gbl>
> Content-Type: text/plain; charset="us-ascii"
> 
> The fishermen in the boat yard I was in put penaten on their prop. Its
diaper cream and they claim that putting it on their propellers stops
stuff from sticking to it. I don't know. Another guy in the boatyard put
shoe polish on his. I put shoe polish on mine last year I will find out
how well it worked when I see the bottom in April Number 155 La Plaoma
> 
> 
> 
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