Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-01-2018, 05:46 PM   #1
Veteran Member
 
City: Wimauma, FL, East Rockaway, NY
Country: usa
Vessel Name: Knot sew Fast
Vessel Model: Pearson Portsmouth
Join Date: Oct 2007
Posts: 89
Spray Cold Galvanizing Experience

Hi Everyone,
This is actually the first time I am posting my own thread to the site, so hope this works.

After reading many experiences of folks using cold galvanizing spray to prevent barnacles on the shaft and props, I decided to give it a whirl this past season. Boat is located on the south shore of Long Island, NY in East Rockaway. Splashed late April and pulled out for winter storage 3rd week of September.

I sanded smooth the shafts and props prior to spraying the 93percent cold galvanizing paint I purchased from Home Depot. This is essentially the same product as the Petit that can be purchased for much more money at marine stores.

The boat was kept at my yacht club on a face dock, with the port side facing west (lots of sunlight) and the starboard side against the face dock (essentially in shade), from April until mid August when it was moved to an inside slip in the marina.

Being on the face dock made it difficult to run the boat due to prevailing winds causing problems docking without people around to help. So not much boat movement.

The attached pictures (hope this works) tell the story. The port side (sunny side) had unbelievable barnacle growth on shafts, yet not on props. Also, on large zinc grounding plate (never experienced this on any boat I've owned). The starboard side (in the shade) had almost no growth on the prop and shaft.

The struts, well that's another story

So for next year I will use the spray galvanizing again (lots of scraping of barnacle to do) as the boat will be in a regular slip , essentially in shade on both sides.
Attached Thumbnails
Click image for larger version

Name:	IMG_0932.JPG
Views:	139
Size:	147.4 KB
ID:	81407   Click image for larger version

Name:	IMG_0933.JPG
Views:	139
Size:	185.4 KB
ID:	81408   Click image for larger version

Name:	IMG_0935.JPG
Views:	128
Size:	96.2 KB
ID:	81409   Click image for larger version

Name:	IMG_0936(1).JPG
Views:	124
Size:	142.5 KB
ID:	81410   Click image for larger version

Name:	IMG_0939.JPG
Views:	130
Size:	160.5 KB
ID:	81411  

__________________
Advertisement

__________________
Paul Schlechter
43'Pearson Portsmouth
Knot Sew Fast
chiropaul is offline   Reply With Quote
Old 10-01-2018, 06:02 PM   #2
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 20,033
People offer mixed results....too many variables to correlate from random posters....so...all you can do is try for yourself....

If vital to keep it all clean....best to go with products with a higher percentage of positive experiences.
__________________

psneeld is offline   Reply With Quote
Old 10-01-2018, 06:16 PM   #3
Guru
 
djmarchand's Avatar
 
City: Litchfield, Ct/Punta Gorda, Fl
Country: USA
Vessel Model: Atlas Pompano 23
Join Date: Aug 2012
Posts: 4,856
Check the bonding wire to that zinc. You usually get very little fouling on zincs that are bonded to the bronze and other metals due to the electrolysis action. If the wire is broken or not attached the zinc isn't doing you any good plus it gets covered by barnacles like you see.



David
djmarchand is offline   Reply With Quote
Old 10-01-2018, 06:27 PM   #4
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,814
About the same here but a little better. The pics are post pressure wash. Last season I went with the same ablative paint as the hull with much, much better results.
Attached Thumbnails
Click image for larger version

Name:	ZincSpray-1.jpg
Views:	110
Size:	135.8 KB
ID:	81412   Click image for larger version

Name:	ZincSpray-2.jpg
Views:	104
Size:	131.5 KB
ID:	81413  
__________________
Archie
1984 Monk 36 Hull #46
Currently southbound in Georgia.
High Wire is offline   Reply With Quote
Old 10-01-2018, 07:24 PM   #5
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 9,992
chiropaul: What if anything did you use on the struts?
Why do you think the growth on the port side avoided the prop while infesting the shaft?
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 10-01-2018, 07:41 PM   #6
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,246
The zinc doesn't work. I even had a friend who smeared Ihle's Paste on his sailboat wheel. I tried zinc paint on the running gear and its only benefit is the boat looks good when you toss it in the water. Works great above the water, I use it on my turnbuckles and I never get barnacles on them!
__________________
Don't believe everything that you think.
Xsbank is offline   Reply With Quote
Old 10-01-2018, 08:08 PM   #7
Moderator Emeritus
 
dwhatty's Avatar
 
City: Home Port: Buck's Harbor, Maine
Country: USA
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,812
Quote:
Originally Posted by Xsbank View Post
The zinc doesn't work. I even had a friend who smeared Ihle's Paste on his sailboat wheel. I tried zinc paint on the running gear and its only benefit is the boat looks good when you toss it in the water. Works great above the water, I use it on my turnbuckles and I never get barnacles on them!

Horses for courses? Depends upon local conditions?


Zinc paint spray on our prop in the relatively cold waters of the NE has worked well for us the past few years (vs nothing, or anti-foul, on the prop). A few, but easily scraped off, barnacles.
__________________
David Hawkins
Deer Isle, Maine
dwhatty is offline   Reply With Quote
Old 10-01-2018, 09:15 PM   #8
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 7,629
I don't think it matters much if you don't use the boat.

I have used prop speed on my charter boat (15 knot cruise) with good results. Didn't work well on my 7 knor trawler. You need significant water flow (speed) to throw the baby barnacles off. Zinc spray worked much better on the trawler. I applied the zinc spray 18 months ago and it was effective for about 8 months of cruising. Imo, the outer surface of the spray loses it's effectiveness in the same way as bottom paints do over time. Fouling of the running gear after 8 months, was much greater on the zinc spray when the boat wasn't used. My takeaway was that most anti fouling works better when there is lots of water flow (boat gets used)

On my trawler, I will continue to use the zinc spray as it's proven to be the most effective for me. Unfortunately, it's effective life is much shorter than my bottom paint. So, the solution is most likely monthly hull and running gear cleanings.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 10-01-2018, 09:20 PM   #9
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 16,097
I used cold galvanizing spray paint on my prop three times. Prior I’ve used ArmorAll squirt spray. And now I’ve gone back to the ArmorAll. I sand the bare prop lightly. Then wipe down the prop w acetone a few minutes before applying the ArmorAll. I spray it on and then brush it all around evenly w a small throwaway brush. Then put it in the sun to dry.

Another variable is that my Willard only puts 37hp into her 18” prop. Lightly loaded.

As Hawkins says about the NE we are in the PNW with relatively cool water.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 10-02-2018, 06:43 AM   #10
Guru
 
Cigatoo's Avatar
 
City: Narragansett Bay
Country: New England
Vessel Model: Grand Banks 36
Join Date: Sep 2016
Posts: 835
As DJ said ohm out that zinc / bonding system. I am betting that it is not working and your prop is taking the hit. That is not the cause of your barnacles however the zinc if working correctly will not grow barnacles and the prop more likely will.
Cigatoo is offline   Reply With Quote
Old 10-02-2018, 06:43 AM   #11
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,762
MR Herrishoff claimed to understand fouling on the boats performance , just imagine the prop blown up to the full size of the boat.
FF is offline   Reply With Quote
Old 10-02-2018, 07:06 AM   #12
Guru
 
boomerang's Avatar
 
City: Kilmarnock VA
Country: united states
Vessel Name: YellowBird MMSI 367769170
Vessel Model: 1978 Mainship m1 #149
Join Date: Apr 2016
Posts: 560
Quote:
Originally Posted by djmarchand View Post
Check the bonding wire to that zinc. You usually get very little fouling on zincs that are bonded to the bronze and other metals due to the electrolysis action. If the wire is broken or not attached the zinc isn't doing you any good plus it gets covered by barnacles like you see.



David
It looks like a bronze ground plate to me. They do get covered with marine growth. Maybe the OP mistakenly called it a zinc?
__________________
-Shawn-
boomerang is online now   Reply With Quote
Old 10-02-2018, 07:29 AM   #13
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 20,033
Quote:
Originally Posted by boomerang View Post
It looks like a bronze ground plate to me. They do get covered with marine growth. Maybe the OP mistakenly called it a zinc?
Agree....though it doesnt look installed flush like I often see them....though I am not positive they should be.
psneeld is offline   Reply With Quote
Old 10-02-2018, 09:10 AM   #14
Guru
 
City: Northport
Country: USA
Join Date: Aug 2015
Posts: 1,430
On the north shore of LI sound we have got very good results using the cold galvanizing spray from Home depot the past 10+ years. On both the props and the shafts (SS) we apply two medium coats of the zinc spray on very clean and dry running gear at each season start and it easily lasts the entire season - typically 7 months or so. We did travel often each week but rarely had the boat sit for a few weeks in very active waters - not a dead end slip where growth was limited.
smitty477 is offline   Reply With Quote
Old 10-02-2018, 11:16 AM   #15
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 20,033
I am completely convinced that moving and even running the boat in place have the most influence...even in most bottom paints too.

The exact same products have such varied results unless in a fairly strict a paint test...which I have never seen where movement was involved.
psneeld is offline   Reply With Quote
Old 10-02-2018, 11:31 AM   #16
Guru
 
Xsbank's Avatar
 
City: Pender Harbour, BC
Country: Canada
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,246
Why would a barnacle happily stick to a poor zinc but eschew sticking to zinc paint? Not logical. If it really did work, wouldn’t you expect bottom paints to include vast proportions of zinc? As much as I hoped it would help, there is no logic here therefore don’t waste your time.

One possible advantage “might” be that the barnacles can’t get as much of a grip on paint and might release easier, but my pressure washing experience says that is not the case. In any event, the little buggers still cling on.
__________________
Don't believe everything that you think.
Xsbank is offline   Reply With Quote
Old 10-02-2018, 11:38 AM   #17
Guru
 
City: Northport
Country: USA
Join Date: Aug 2015
Posts: 1,430
Quote:
Originally Posted by psneeld View Post
I am completely convinced that moving and even running the boat in place have the most influence...even in most bottom paints too.

The exact same products have such varied results unless in a fairly strict a paint test...which I have never seen where movement was involved.
For a number of years we put primer and bottom paint on one side and penaten zinc rich diaper cream on the other.
Then we put primer and bottom paint on one and the cold galvanize paint on the other.
They all worked for a while but these were the differences:
- penaten works well for about 12 weeks or so , then it begins to lose its ability to avoid growth and is impossible to recoat in the water.
- primer and bottom coat work equally as well as the cold zinc spray for a single season. After one season the bottom paint still has the ability to avoid growth but requires much touch up in many spots and often needs spot cleaning during the end of the season.
Because we came out of the water each season in the northeast (Northport NY) it was easier, and quicker and more economical to stay with the cold galvanize spray.

Typical for us anyway with between 20-22" dai 4 blade NiBral props and SS shafts in Long Island sound on a boat that does higher than hull speed for about 7 months.
smitty477 is offline   Reply With Quote
Old 10-02-2018, 12:11 PM   #18
Guru
 
psneeld's Avatar
 
City: AICW
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 20,033
And your tests were good for you, but they may have no bearing on other boats and their use/location/ etc...

In my mind it is not a product with great repeatability or reliability between users compared to other products.

Users should be warned that their results with cold galvanizing spray could be completely unexpected.
psneeld is offline   Reply With Quote
Old 10-02-2018, 12:29 PM   #19
Guru
 
City: Northport
Country: USA
Join Date: Aug 2015
Posts: 1,430
Quote:
Originally Posted by psneeld View Post
And your tests were good for you, but they may have no bearing on other boats and their use/location/ etc...

In my mind it is not a product with great repeatability or reliability between users compared to other products.

Users should be warned that their results with cold galvanizing spray could be completely unexpected.
Exactly , absolutely - just like all other products, the are of use as well as the application and usage of the boat will vary results.
smitty477 is offline   Reply With Quote
Old 10-02-2018, 05:45 PM   #20
Veteran Member
 
City: Wimauma, FL, East Rockaway, NY
Country: usa
Vessel Name: Knot sew Fast
Vessel Model: Pearson Portsmouth
Join Date: Oct 2007
Posts: 89
Spray Cold Galvanizing Experience

Thanks to everyone for their responses. Yes, it is a zinc "Diver's Buddy" plate that I installed last spring, and yes all bonding wires throughout the boat are intact and terminate at this locations. So not sure why this occurred.


If you look at shaft zincs and rudder zincs, they show signs of activity. Again don't understand the plate situation.


The boat had been hauled in August 2017 shortly after I purchased it and the bottom cleaned and painted with an ablative Interlux paint. Not sure which one. Boat hauled for winter in late Sept. 2017 and relaunched April 2018. The winter storage fee includes painting in the spring and it's possible those doing the painting forgot to do the struts and rudders. The hull held up great, not a barnacle in site.


I just wanted to post my observations for those on the forum who were contemplating the zinc spray approach.


My prior boat, which was kept in Tampa Bay had used Propspeed which was the best product to prevent barnacle growth I had ever used. Was able to have it done cheaply as yard I was in had some left over that they wanted to get rid of.
__________________

__________________
Paul Schlechter
43'Pearson Portsmouth
Knot Sew Fast
chiropaul 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





All times are GMT -5. The time now is 06:13 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×