Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 30-05-2013, 13:21   #1
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Zinc Pyrithione Bottom Paint

I'm hauling out tomorrow and will be the test dummy for a newly released copper-free bottom paint. It's called SEAVOYAGE, by Sherwin Williams, and produced locally in San Diego by Pro-Line Paints, an old, well established institution here. The Navy has been using the formulation here in San Diego Bay for the last five years and has been saying good things about it. It got its clearance from the State of California just three weeks ago. It is offered in only two colors, at the moment, with more to come as it gains acceptance. I am using the Black color instead of the red. It is a vinyl base, requiring a solvent thinner, and is supposed to provide greater coverage per gallon. I have been given two gallons to apply for the test, which is sufficient for my 40 foot Searunner trimaran. I currently have little or no remaining bottom paint on the epoxy graphite surfaced hulls, so I will be using an epoxy primer first. The active ingredient is zinc pyrithione (yeah, the same stuff as in Head & Shoulders shampoo). The natural source of the secret sauce is from echinacea (marigold flowers) and it has antibacterial and antifungal qualities. I'm told I should get about four years of protection from two coats on the bottom and a third at the waterline. With the speed of my boat, I should be able to give it a good test. I'll send some pics of the application process next week, as well as timely updates on its performance.
__________________

__________________
Roy M is offline   Reply With Quote
Old 30-05-2013, 13:31   #2
Registered User

Join Date: Jul 2006
Posts: 3,949
Re: Zinc Pyrithione Bottom Paint

Neat! I hope it works out well. Can it be applied over old paint, or do you have to start with a stripped bottom?
__________________

__________________
Kettlewell Cruising
Kettlewell is offline   Reply With Quote
Old 30-05-2013, 13:51   #3
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
In a quick read of the documents it appears able to coat previously leached bottom paint. When I'm back at the computer I'll send the full details. Right now I'm in the middle of preps to leave the dock. My application will be on a clean hull with fresh epoxy primer.
__________________
Roy M is offline   Reply With Quote
Old 30-05-2013, 14:31   #4
Registered User
 
Teknav's Avatar

Join Date: Jul 2012
Location: Texas - USA
Boat: Twin Otter de Havilland Floatplane
Posts: 1,838
Re: Zinc Pyrithione Bottom Paint

Zinc Pyrithione is effective against fungi/mildew and algae buildup because of its highly bonded sulfur content. It is used in soaps for skin dryness/fungal buildup and such. UV exposure will not affect it much. When it comes to fighting barnacles build-up on your boat's bottom, you will still need a copper based paint. Arsenic and copper are toxic to barnacles, hence they are in the formulations of many boat's paints. Mauritz
__________________
Teknav is offline   Reply With Quote
Old 30-05-2013, 15:08   #5
Registered User

Join Date: Jan 2012
Posts: 1,172
Images: 15
Re: Zinc Pyrithione Bottom Paint

prop and outdrive antifoul paints are zinc
__________________
tamicatana is offline   Reply With Quote
Old 30-05-2013, 17:57   #6
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Re: Zinc Pyrithione Bottom Paint

As the wise guys say: "We shall see".

Here is the data: http://www.paintdocs.com/webmsds/web...prodno=N51B301

http://www.paintdocs.com/webmsds/web...prodno=N51R301
__________________
Roy M is offline   Reply With Quote
Old 27-06-2015, 10:11   #7
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Re: Zinc Pyrithione Bottom Paint

Well, it's been two years now using the copper-free SEAVOYAGE bottom paint by Sherwin-Williams. Much of it is now gone from the hull. but due to regular monthly cleaning by one of the most conscientious divers (Bruce of OMNI Precision Diving) in San Diego Bay, the bottom is in good, but needy, condition. I will be hauling out this summer to redo my bottom. My yacht club participates in a program to monitor pollution levels and ensure best marine practices by our divers. Our member that is involved in the study, a retired biologist and active sailor, has revealed to me that the current information regarding bottom paint now shows these copper-free alternatives to be of marginal value. This has been confirmed by Practical Sailor's 2015 test of bottom paints. In fact, their study shows ALL available bottom paints in the US (other than tributyltin) provide less than stellar performance. The best was rated POOR +.

So, fstbttms appears to be our most knowledgeable resource. What is your suggestion for a durable, long lasting copper paint available in California? I will be having it applied to both my forty foot trimaran, and a thirty-nine foot power catamaran recently purchased by a friend. Both boats will be making extended voyages in the next couple years to warm waters.
__________________
Roy M is offline   Reply With Quote
Old 27-06-2015, 10:16   #8
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Zinc Pyrithione Bottom Paint

Quote:
Originally Posted by Roy M View Post
So, fstbttms appears to be our most knowledgeable resource. What is your suggestion for a durable, long lasting copper paint available in California?
Not even a question- Pettit Trinidad.
__________________
fstbttms is offline   Reply With Quote
Old 27-06-2015, 10:24   #9
Senior Cruiser
 
Roy M's Avatar

Cruisers Forum Supporter

Join Date: Feb 2007
Location: Southwestern Yacht Club, San Diego, CA
Boat: Searunner 40 trimaran, WILDERNESS
Posts: 3,042
Images: 4
Re: Zinc Pyrithione Bottom Paint

Thank you!
__________________

__________________
Roy M is offline   Reply With Quote
Reply

Tags
paint

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:12.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.