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Zinc paint question
- Thread starter HOGAN
- Start date
I don't know if there is Zinc in Primocon, but it is effective to prevent barnacle formation on underwater metals. The Interlux rep explained to me that it works by providing a barrier to current flow that depletes the copper from the paint. I found that barnacles formed on underwater metal even though the bottom paint was in tack. Now I use it under bottom paint for about 5 years and the barnacle problem went away.
If zinc is the primary ingredient in Primocon, then the other products may also work if they electrically isolate the bottom paint from the bronze underwater gear. I cannot find out if Primocon has Zinc, I doubt it.
From Interlux:
"Primocon was formulated and intended to be an anticorrosive primer therefore it should not be considered a chlorinated rubber primer. Many years ago we had chlorinated rubber primers available, however they are typically a bit complex during the application and generally have VOC levels which are quite high, those challenges along with the lack of demand we had chosen to remove these from our product range. Roughly 15+ years ago we had a demand for from our customers for a single component anticorrosive primer which is easily to apply and fairly low in VOC's which is where Primocon had been formulated and launched. Since that time we have also found that it works as an excellent holding primer on all surfaces as well as a tie coat primer on unknown antifouling paints. Unlike many chlorinated rubber primers, Primocon is strictly for use below the waterline and in conjunction with antifouling paints only."
http://www.yachtpaint.com/can/diy/products/primers/primocon.aspx
If zinc is the primary ingredient in Primocon, then the other products may also work if they electrically isolate the bottom paint from the bronze underwater gear. I cannot find out if Primocon has Zinc, I doubt it.
From Interlux:
"Primocon was formulated and intended to be an anticorrosive primer therefore it should not be considered a chlorinated rubber primer. Many years ago we had chlorinated rubber primers available, however they are typically a bit complex during the application and generally have VOC levels which are quite high, those challenges along with the lack of demand we had chosen to remove these from our product range. Roughly 15+ years ago we had a demand for from our customers for a single component anticorrosive primer which is easily to apply and fairly low in VOC's which is where Primocon had been formulated and launched. Since that time we have also found that it works as an excellent holding primer on all surfaces as well as a tie coat primer on unknown antifouling paints. Unlike many chlorinated rubber primers, Primocon is strictly for use below the waterline and in conjunction with antifouling paints only."
http://www.yachtpaint.com/can/diy/products/primers/primocon.aspx
quote:
Originally posted by btoran
i've used the petit product for one season and the rustoleum for one season as a test. both do a good job of keeping growth off the running gear. the petit product is 98% zinc (and $30 per can around here) vs 93% zinc (and $4.95 per can) for the rustoleum. i'm using rustoleum again this season.
I don't understand how the Pettit product has 98% zinc and the Rustoleum only 93% when the MSDS for the Pettit shows a range of 30-50% and Rustoleum shows a solid 50%. That tells me the that they are, at best, the same. At worst, the Rustoleum has a greater percentage of zinc.
Capt. Bill1
Active member
- Joined
- Jan 1, 2000
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- 2017
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- 6,127
quote:
Originally posted by Robyns Nest
If it can't get wet, doesn't stop a barnacle from clinging to it.
You need something there to retard the plant growth and the shell growth.
If the water was not touching the surface of the part on a molecular level how would the juvenile barnacle suspended in the water attach it self to the surface?
I have been using the Rustoleum cold Galvanizing for years on antenna mounts and tower work. The stuff works extremely well in those applications. I'm thinking about trying it on the running gear of my soon to be new to me trawler.
Bill
Bill
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- Jun 4, 2001
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- 4846
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quote:
Originally posted by Capt. Bill1
quote:
Originally posted by Robyns Nest
If it can't get wet, doesn't stop a barnacle from clinging to it.
You need something there to retard the plant growth and the shell growth.
If the water was not touching the surface of the part on a molecular level how would the juvenile barnacle suspended in the water attach it self to the surface?
The same way he attaches now. When he attaches he displaces the water between him and the surface. He only need the water to surround him which it will do.
- Joined
- Jun 4, 2001
- RO Number
- 4846
- Messages
- 3,913
quote:
Originally posted by Kevdon22
I don't know if there is Zinc in Primocon, but it is effective to prevent barnacle formation on underwater metals. The Interlux rep explained to me that it works by providing a barrier to current flow that depletes the copper from the paint. I found that barnacles formed on underwater metal even though the bottom paint was in tack. Now I use it under bottom paint for about 5 years and the barnacle problem went away.
This is why you use non copper paint on the running gear. Even if you miss one little spot with the zinc it can deplete the copper.
Capt. Bill1
Active member
- Joined
- Jan 1, 2000
- RO Number
- 2017
- Messages
- 6,127
quote:
Originally posted by Robyns Nest
quote:
Originally posted by Capt. Bill1
quote:
Originally posted by Robyns Nest
If it can't get wet, doesn't stop a barnacle from clinging to it.
You need something there to retard the plant growth and the shell growth.
If the water was not touching the surface of the part on a molecular level how would the juvenile barnacle suspended in the water attach it self to the surface?
The same way he attaches now. When he attaches he displaces the water between him and the surface. He only need the water to surround him which it will do.
You are probably right. But I wonder if the juvenile barnacle has the strength to push through the surface tension of the water to get to the solid surface of the running gear? And I wonder what would happen once the gears starts rotating?
- Joined
- Jun 4, 2001
- RO Number
- 4846
- Messages
- 3,913
Don't know the answer to that. But if hydrophobic paint worked, you would see it being sold today.