Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-31-2021, 03:40 PM   #1
Guru
 
backinblue's Avatar
 
City: Stratford, CT
Vessel Name: Blue Moon
Vessel Model: Mainship Pilot 355
Join Date: Jan 2019
Posts: 3,937
Barnacle problem

My boat collects a LOT of barnacles on the underwater metals during a 7 month summer season. The marina paints the bottom for me and I forget exactly what they use for the metals but it's an anti-fouling paint made for metal, like you would use on an outdrive for instance. My main concern and my main question is dealing with the bronze hull strainers at the water intake thru-hulls. They not only get covered in barnacles, but the barnacles also get inside the strainers and are hard to clean out. I'm worried about an over-heating problem some day. Any suggestions on what might work well on bronze specifically? Is zinc paint ok to try such at Pettit Barnacle Barrier? Any other suggestions?
Attached Thumbnails
strainer.jpg  
__________________
“In my walks, every man I meet is my superior in some way, and in that I learn from him.” ― Ralph Waldo Emerson
backinblue is offline   Reply With Quote
Old 03-31-2021, 04:44 PM   #2
Arc
Guru
 
City: Long island
Vessel Model: Eastern
Join Date: Aug 2018
Posts: 633
South Bay strainers. They allow you to remove the grate and clean and paint inside. On Long Island they are a must have item. We have lots of eel grass
Arc is offline   Reply With Quote
Old 03-31-2021, 05:06 PM   #3
Guru
 
Cigatoo's Avatar
 
City: Narragansett Bay
Vessel Model: Grand Banks 36 Classic #715
Join Date: Sep 2016
Posts: 1,857
Quote:
Originally Posted by Arc View Post
South Bay strainers. They allow you to remove the grate and clean and paint inside. On Long Island they are a must have item. We have lots of eel grass
What Arc said. I installed one on my last boat. Easy to paint. Pull a pin and it opens for cleaning.
__________________
Carl
Cigatoo is offline   Reply With Quote
Old 03-31-2021, 05:36 PM   #4
Guru
 
High Wire's Avatar
 
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,966
We use the same bottom paint on the strainers as the bottom itself. No real issues with a 6 month season in SW FL or on a 14 month trip up and back along the East Coast.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
High Wire is offline   Reply With Quote
Old 03-31-2021, 08:06 PM   #5
Guru
 
fgarriso's Avatar
 
City: .
Vessel Name: GOTCHA
Vessel Model: Hatteras 58 LRC
Join Date: Jun 2019
Posts: 1,103
With 4 years in warm Florida waters we initially had the same problem. During a haul out we cleaned the strainer grates only to find the inside was full also. The man that owns the boat yard suggested that we try cold galvanizing spray from 3-M. We used it on all of the bronze intakes and outlets. At our next haul out two years later we found that everything was still clean. I don't know if the stuff is recommend for that use, but it worked well for us.
__________________
Captain F. Lee - R.P.E.
USCG 200 GT Master
fgarriso is offline   Reply With Quote
Old 04-01-2021, 06:19 AM   #6
Guru
 
backinblue's Avatar
 
City: Stratford, CT
Vessel Name: Blue Moon
Vessel Model: Mainship Pilot 355
Join Date: Jan 2019
Posts: 3,937
Quote:
Originally Posted by fgarriso View Post
With 4 years in warm Florida waters we initially had the same problem. During a haul out we cleaned the strainer grates only to find the inside was full also. The man that owns the boat yard suggested that we try cold galvanizing spray from 3-M. We used it on all of the bronze intakes and outlets. At our next haul out two years later we found that everything was still clean. I don't know if the stuff is recommend for that use, but it worked well for us.
Thanks I think I will try the same. I appreciate the suggestions for removable strainers but that is not a simple change because mine are part of the thru-hull and seacock and I don't want to tackle that a couple weeks before launch. I will try to clean as best I can from inside and outside the boat and spray with zinc the best I can.
__________________
“In my walks, every man I meet is my superior in some way, and in that I learn from him.” ― Ralph Waldo Emerson
backinblue is offline   Reply With Quote
Old 04-03-2021, 09:35 AM   #7
Guru
 
City: Melbourne, FL
Join Date: Dec 2014
Posts: 1,731
Feed a piece of heavy gauge copper wire into the cavity of the strainer in a loop and it will kill off any invertebrates that venture inside the strainer.
stubones99 is offline   Reply With Quote
Old 04-04-2021, 02:28 PM   #8
Guru
 
Brooksie's Avatar
 
City: Cape Cod, MA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 1,306
Copper bottom paint goes dead on metal unless it has a barrier between it and the metal. You could use a non-metallic primer (several coats) or I have had luck coating all my metal, except propeller with thickened epoxy. Then apply your bottom paint and it will work. Layer upon layer of "dead" bottom paint can also act as a barrier but that's doing it the hard way.
Brooksie is offline   Reply With Quote
Old 04-04-2021, 02:45 PM   #9
Guru
 
Simi 60's Avatar
 
City: Queensland
Vessel Model: Milkraft 60 converted timber prawn trawler
Join Date: Jul 2016
Posts: 5,482
Quote:
Originally Posted by Brooksie View Post
Copper bottom paint goes dead on metal unless it has a barrier between it and the metal. You could use a non-metallic primer (several coats) or I have had luck coating all my metal, except propeller with thickened epoxy. Then apply your bottom paint and it will work. Layer upon layer of "dead" bottom paint can also act as a barrier but that's doing it the hard way.

It's interesting stuff

I thought we had electrical issues and had a corrosion expert on ours recently trying to find out why we are blowing antifoul and epoxy primer off of the bronze prop and bronze rudder but not the adjacent steel nozzle (epoxy primer coated and free of growth) or full length steel shoe (no epoxy coating and covered in growth) The shoe did have vinyguard used prior to antifoul.

Electrically we checked out ok but apparently it is to do with noble metals and where copper, bronze and steel are on the scale.

He said we need to go multiple coatings of the epoxy primer on the bronze and steel to make it invisible to the high copper content antifouling.
Simi 60 is offline   Reply With Quote
Old 04-04-2021, 09:51 PM   #10
Senior Member
 
Knot Salted's Avatar
 
City: Muskegon, MI
Vessel Name: Knot Salted
Vessel Model: 1981 Californian 34 LRC
Join Date: Mar 2015
Posts: 322
Quote:
Originally Posted by Brooksie View Post
Copper bottom paint goes dead on metal unless it has a barrier between it and the metal. You could use a non-metallic primer (several coats) or I have had luck coating all my metal, except propeller with thickened epoxy. Then apply your bottom paint and it will work. Layer upon layer of "dead" bottom paint can also act as a barrier but that's doing it the hard way.


Huh?
Knot Salted is offline   Reply With Quote
Old 04-13-2021, 05:21 PM   #11
Veteran Member
 
City: penngrove
Vessel Name: Lucky Us
Vessel Model: Kadey Krogen 39
Join Date: Oct 2018
Posts: 39
I posted on this subject about the "Sonihull" electronic hull cleaner. I can't say if it works, but it sounds good!!
z1nonlyone is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 09:21 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012