Reply
 
Thread Tools Display Modes
 
Old 04-07-2015, 05:23 PM   #21
Guru
 
Capt.Bill11's Avatar
 
City: Sarasota/Ft. Lauderdale
Country: USA
Join Date: Apr 2014
Posts: 5,422
Quote:
Originally Posted by BruceK View Post
Good decision,I wanted propspeed on props, shafts, and skegs, yard said it only works on things that move/spin. We left the skegs,which foul with barnacles despite coats of hard a/f. If you get a good result from zinc spray on the shoe, can you remember to post it, when you know.

PropSpeed works on rudders and struts. And SS of course.
__________________
Advertisement

Capt.Bill11 is offline   Reply With Quote
Old 07-02-2016, 03:48 PM   #22
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 1,601
Just want to add that I used the HD/Rustoleum cold galvanizing spray and had marginal results. This is 6 months of exposure; Nov 2015 to end of April 2016 in SW FL and about 700 nm cruising at 6.8 kts.
Attached Thumbnails
Click image for larger version

Name:	ZincSpray-2.jpg
Views:	130
Size:	131.5 KB
ID:	53764  
__________________

__________________
Archie
1984 Monk 36 Hull #46
Englewood, FL and Cape May, NJ
High Wire is offline   Reply With Quote
Old 07-02-2016, 04:45 PM   #23
Guru
 
AusCan's Avatar
 
City: Adelaide
Country: Australia
Vessel Name: Kokanee
Vessel Model: Cuddles 30 Pilot House Motor Sailer
Join Date: Jul 2012
Posts: 2,096
I recently checked my stainless keel shoe which was coated with a cheap zinc based cold galvanizing spray. It possibly may have slowed the fouling slightly, but still plenty of scraping required. Certainly no miracles.

I'll go with Prop Speed on the shoe next time when I redo the prop.
AusCan is offline   Reply With Quote
Old 07-02-2016, 06:10 PM   #24
Guru
 
City: Melbourne, FL
Country: USA
Join Date: Dec 2014
Posts: 918
Quote:
Originally Posted by dwhatty View Post
Does lead repel barnacles? The Pettit product has done well for our Northerly climate boat's prop. Dunno about lead. And which is worse for the environment?
High concentrates of heavy metals kill all invertebrates / crustaceans which is why many bottom paints use copper oxides...
stubones99 is online now   Reply With Quote
Old 07-02-2016, 10:17 PM   #25
Guru
 
City: Between Oregon and Alaska
Country: US
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 650
Copper alone doesn't do it. I have a wood boat with a copper plated bottom. I still have to paint.
Lepke is offline   Reply With Quote
Old 07-06-2016, 06:14 AM   #26
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,529
"I still have to paint."

Scrub clean more often and there is no need for paint on copper..
FF is offline   Reply With Quote
Old 05-23-2017, 02:50 PM   #27
Newbie
 
City: South Carolina
Country: USA
Join Date: May 2017
Posts: 1
Quote:
Originally Posted by Boydski View Post
I think both products are very similar. The Rustoleum is 50% zinc in the can and claim it's 93% zinc once the coating dries. Pettite claims the dried coating is the "highest possible zinc concentration". I bet that's 93%.

I have found quite a few of the aerosol cold galvanizing compound on the web and it looks as though ZRC is leading. Anyone have an idea of which one is better or are they all about the same as far as durability? I have been looking at Galvalox, Galvalox Cold Galvanizing Compound – True Galvanic Protection but I'm just not sure which direction to go. Any input would be great. Thanks.
Save
eggheadgeorge is offline   Reply With Quote
Old 05-23-2017, 03:10 PM   #28
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 9,996
Greetings,
Mr. egg. Welcome aboard.
__________________
RTF
RT Firefly is online now   Reply With Quote
Old 05-23-2017, 04:24 PM   #29
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,903
Eggheadgeorge....Not sure what you are looking for...or what you plan to do with it....

But as my previous post state, zinc on my prop did little to nothing.

If it did anything, it just made the surface a little slicker so maybe it took a little longer for stuf to grow.
psneeld is online now   Reply With Quote
Old 05-23-2017, 04:39 PM   #30
Guru
 
City: Between Oregon and Alaska
Country: US
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 650
Quote:
Originally Posted by FF View Post
"I still have to paint."

Scrub clean more often and there is no need for paint on copper..
Stuff grows unless the copper is sanded bright with no missed areas. I have done tests. Sanding every haul out would eliminate the copper, about 16 gauge, in a few years.
But, if you like I'll let you know next haul out and you can try it.
Lepke is offline   Reply With Quote
Old 05-23-2017, 05:24 PM   #31
Guru
 
hmason's Avatar
 
City: Westport, CT
Country: USA
Vessel Name: Magic
Vessel Model: Grand Banks 46 Europa
Join Date: Aug 2013
Posts: 1,901
I spray my props with Rustoleum Cold Galvanizing Compound at every haul out. I "think" they don't support as much growth. My diver agrees they look better. It's cheap enough and causes no harm that I know of.
__________________
Howard
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL
hmason is offline   Reply With Quote
Old 05-23-2017, 07:33 PM   #32
Senior Member
 
boomerang's Avatar
 
City: Kilmarnock VA
Country: united states
Vessel Name: YellowBird
Vessel Model: 1978 Mainship m1 #149
Join Date: Apr 2016
Posts: 153
Quote:
Originally Posted by Lepke View Post
Stuff grows unless the copper is sanded bright with no missed areas. I have done tests. Sanding every haul out would eliminate the copper, about 16 gauge, in a few years.
But, if you like I'll let you know next haul out and you can try it.
boomerang is offline   Reply With Quote
Old 05-23-2017, 07:38 PM   #33
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 1,601
This season I used the same ablative paint as on the bottom. Only a tiny fraction of the growth as in post 22.
__________________
Archie
1984 Monk 36 Hull #46
Englewood, FL and Cape May, NJ
High Wire is offline   Reply With Quote
Old 05-23-2017, 08:31 PM   #34
Guru
 
City: kemah
Country: USA
Join Date: May 2015
Posts: 997
Anyone cold galvanized anchor chains?
what_barnacles is offline   Reply With Quote
Old 05-23-2017, 08:34 PM   #35
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,903
I use it to touch up my chain and anchor everyseason...never seems to wear like the hot dipped stuff (OEM)
psneeld is online now   Reply With Quote
Old 05-23-2017, 08:52 PM   #36
Guru
 
City: Northport
Country: USA
Join Date: Aug 2015
Posts: 813
I have used the Rustoleum cold spray (no primer) for 5 seasons and it lasts our full season (about 5-6 months) here in the Long Island sound with almost no growth. Since our boats do plane we find out pretty quickly when the rotating parts have any growth on them>
2 cans give two good medium coats on the 21 X 24 props and the SS shafts.
In the past we have used various other methods including prime and bottom paint, 'special' prop sprays, penaten and a few others.
The cold galvanize was the best for us and happened to be the most economical as well - prep is required before the spray for good adhesion.
smitty477 is offline   Reply With Quote
Old 05-23-2017, 09:21 PM   #37
Newbie
 
City: CAPE ELIZABETH ME
Country: USA
Vessel Name: SORCERER
Vessel Model: GRAND BANKS 36 CLASSIC
Join Date: Jan 2015
Posts: 1
I have actually done a direct comparison of the Pettit and Rustoleum Cold Galvanizing spray products. It was carried out in the relatively brackish waters of Portland Harbor and cold waters of Casco Bay (Maine).
When I first purchased my current boat four years ago (a twin engine GB 36 Classic) the props were covered in barnacles. On the advice of another boater owner friend, I used the Pettit spray the next year. One prop got two coats and the other got only one. The shafts got none. When the boat was pulled in the fall, the prop with two coats look pretty good. The prop with one coat not as good and the shafts were bad. The next year I put three coats of the Pettit spray on one prop and shaft and three coats of Rustoleum on the other prop and shaft. That fall both props and both shafts were barnacle free - not a one. There was absolutely no difference between the two products.
In summary - the two products performed equally well but the coverage (number of coats) appears to be important. One added, unexpected advantage was a longer sacrificial zinc life. My shaft zincs were barely worn. In hindsight, I suppose this should be expected. These sprays are just another way to apply a sacrificial zinc.
This year I am trying the Rustoleum on the struts and trim tabs as well.
GPBLENKHORN is offline   Reply With Quote
Old 05-23-2017, 09:29 PM   #38
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,903
While I can't say the galvanizing paint does or doesn't work...because my experience and others is far from scientific...


I will say that I too believe that a healthy coat on shafts, props and rudders, whether topped with antifouling or not...does seem to help my zinc anodes too.


Not scientific but painting underwater metals does usually slow down any galvanic action.
__________________

psneeld is online now   Reply With Quote
Reply

Thread Tools
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





All times are GMT -5. The time now is 09:22 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012