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Old 12-21-2009
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Question Chesapeake Bay prop barnacles: how to prevent

This winter I plan to paint my prop to prevent barnacles.

It seems they (barnacles) are becoming more of a problem.

On my last boat, I used the Interlux system: several coats of primer, followed by several coats of epoxy, followed by a hard bottom paint.

This system worked very well, but is laborious, and I wonder if anyone has experience with a simpler system that works on the Bay, and is not too costly. I still have primer, epoxy, and paint left from my last boat, so it would be inexpensive.

As I type this, I seem to be making a convincing argument just to do the same thing with First Sight.
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Old 12-21-2009
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We've had good luck with Pettit Zinc Coat Barnacle Barrier.
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Pacific Seacraft Crealock 31 #62

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Old 12-21-2009
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Petit Zinc Coat Barnacle Barrier

Looks good, and not too costly. I will give it a try.

Do you need to prime first? Doesn't sound like it.

To what extent do you polish the prop before applying?

How many coats?

Come the next year, do you sand it off, or just apply a new coat?

(Since I already know your boat spends most of the year in the water, I appreciate your advice).
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Old 12-21-2009
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I too keep my boat in the Chesapeake and get barnacles on my prop (Max-Prop) and wondered about painting it. I called Max Prop and they advised against painting the prop. they suggested coating it with petroleum jelly, which I did. This seems to work for a while and it makes it very easy to scrape the little buggers off. For me it is more pleasant to go for a swim a couple times a summer than deal with paint ( I try to do this when becalmed or hove-to in very deep water to reduce likelihood of getting stung by nettles, which plague the Chesapeake).
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Old 12-21-2009
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Ours is a fixed, three-blade bronze prop.

The prop gets thoroughly cleaned and dried. No primer necessary. We've done just one coat (when the boat was hanging in slings) with good results, but multiple coats are better.

Over the course of a season or two, it seems to slough off. If there's any remaining that is still tenacious, you can paint over it.
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Pacific Seacraft Crealock 31 #62

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Quote:
Originally Posted by okapi3 View Post
I too keep my boat in the Chesapeake and get barnacles on my prop (Max-Prop) and wondered about painting it. I called Max Prop and they advised against painting the prop. they suggested coating it with petroleum jelly, ...
I'm not sure who you mean by Max Prop, but when I spoke with the folks at PYI about this subject about 10 years ago, they recommended the Pettit zinc paint that they sell as a Max Prop assecory . I've used it for the last ten years on my Max Prop and it works perfectly.

Clean the prop first, shaft too, spray on three coats.
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I've had good results with Prop Speed. I am in Beaufort, SC and the fouling can get pretty bad during the warmer months. Most everything slings off of the prop within seconds except for very close to the hub (lower speed) but that comes off with very little effort.

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Old 12-21-2009
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Pettit Barnacle Barrier Zinc Spray

APPLICATION INFORMATION
Shake can vigorously for two minutes after mixing balls begin to rattle. Shake often during use. Hold can upright 12 to 16 inches from the surface
and spray in a steady back-and-forth motion, slightly overlapping each stroke. Keep the can the same distance from the surface and in motion
while spraying. Applying in thin coats. Allow no more than 5 minutes between two or three thin coats, otherwise allow to dry one hour before
applying additional coats.
When finished spraying, clear spray valve by turning can upside down and spraying until no more paint comes out. If valve clogs, twist and pull off
spray tip and rinse it in a solvent such as mineral spirits. Do not stick a pin or other object in the stem.
SURFACE PREPARATION
Remove all paint from underwater metals and running gear by sanding, scraping, sandblasting or by using a paint and varnish remover. Once back
to bare, clean metal wipe the surface with Pettit 120 Brushing Thinner and let dry. For application to metals above the waterline remove all paint
and
rust with a wire brush or sandpaper. Lightly sand glossy surfaces. Clean surface with Pettit 120 Brushing Thinner and let dry.

NOT FOR USE ON ALUMINUM, FIBERGLASS OR WOOD

http://www.pettitpaint.com/fileshare...ds/1179320.pdf
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Last edited by T37Chef; 12-22-2009 at 10:02 AM.
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Old 12-21-2009
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Petits Zinc Spray for me...MGM
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Old 12-23-2009
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Thanks for the input

I appreciate everyone's thoughts.

The Petit product is not available at my local West Marine.

A small independant chandlery that caters to crabbers carries it, but the owner says Interlux Trilux is his recommendation.

I have never used this product because is says on the can it is for aluminum. He (the owner) says it works great on props if one applies at least three coats.

I think I will buy the Petit Zinc.

Again, thanks for everyone's input.
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