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Old 18-05-2011, 22:58   #1
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"Special" vs. "Normal" Primer for Prop?

Does one have to use the special, expensive primer specifically marketed for use on bronze props prior to antifouling, or will any generic primer work OK (not necessarily as well, but acceptably well)?

Hempels and similar is nearly 10x the cost of regular, e.g. automotive anticorrosion primer.

???
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Old 18-05-2011, 23:56   #2
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Re: "Special" vs. "normal" primer for prop?

Why not this?
PROPSPEED
and pictures
http://www.rlmarine.com.au/propspeed.html
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Old 18-05-2011, 23:58   #3
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Re: "Special" vs. "normal" primer for prop?

Quote:
Originally Posted by cat man do View Post
PROPSPEED

Why not this?
1. I'm splashing the boat in a matter of days and can't get it locally.
2. I already have the hard antifouling paint, and just need to put primer on the polished prop before putting the antifouling.
3. It's probably more expensive than the Hempel prop primer.
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Old 19-05-2011, 08:15   #4
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Re: "Special" vs. "Normal" Primer for Prop?

Typical bottom paint isn't intended nor is it practical for use on a prop which spins thereby wearing off typical paint way too fast. There are also valid arguments pointing to how copper bottom paint exacerbates electrolysis on a prop and priming it won't change that.

Buy an inexpensive can of Petit Zinc Coat Barnacle Barrier paint which is intended specifically for this purpose and has been found to be highly effective at minimizing growth on a prop.
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Old 19-05-2011, 13:02   #5
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Re: "Special" vs. "Normal" Primer for Prop?

Quote:
Originally Posted by S/V Illusion View Post
Typical bottom paint isn't intended nor is it practical for use on a prop which spins thereby wearing off typical paint way too fast. There are also valid arguments pointing to how copper bottom paint exacerbates electrolysis on a prop and priming it won't change that.

Buy an inexpensive can of Petit Zinc Coat Barnacle Barrier paint which is intended specifically for this purpose and has been found to be highly effective at minimizing growth on a prop.
This is interesting! According to the Mfg, it leaves a nearly pure Zn coating when dry. Sounds good for corrosion resistance, but where have you seen data about its anti-fouling properties on props? Sounds too good to be true to me... I certainly have had barnies and other growth on my sacrificial Zn anodes, and on galvanized chain.

So, anyone with personal experience or good references to this stuff?

Cheers,
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Old 19-05-2011, 14:51   #6
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Re: "Special" vs. "Normal" Primer for Prop?

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Originally Posted by Jim Cate View Post
Sounds good for corrosion resistance, but where have you seen data about its anti-fouling properties on props?

Cheers,
I'm sure others will share similar experiences. We have used it in both New England and Florida which are obviously vastly different in terms of environmental conditions. Efficacy is better than anything else I've tried with little or no barnacles or other growth after one season and minimal growth after two. Same with lots of other folks I know who turned me on to it.
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Old 19-05-2011, 16:37   #7
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Re: "Special" vs. "Normal" Primer for Prop?

Quote:
Originally Posted by S/V Illusion View Post
I'm sure others will share similar experiences. We have used it in both New England and Florida which are obviously vastly different in terms of environmental conditions. Efficacy is better than anything else I've tried with little or no barnacles or other growth after one season and minimal growth after two. Same with lots of other folks I know who turned me on to it.
So, it is sounding ok so far... anyone else??

I wonder if it is available in Oz? Hard to transport spray cans from the US to downunder in small batches.

Cheers,
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Old 19-05-2011, 16:54   #8
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I second the use of Petit Zinc Coat Barnacle Barrier paint. It's cheap and really works.
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Old 20-05-2011, 18:39   #9
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Re: "Special" vs. "Normal" Primer for Prop?

I have seen metallic zinc applied to the hulls of steel boats using a torch and powdered metal. Just wondering if this technique would work on bronze props. kind of a hot dip galvanizing thing.
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Old 22-05-2011, 19:39   #10
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Re: "Special" vs. "Normal" Primer for Prop?

Most yards Ive been at recommend tie coat. a latex based primer that is used between the metal and bottom paints to prevent reaction between the metals in the paint and hardware. Its cheap, fast and should be easy to find.
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Old 22-05-2011, 20:01   #11
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Re: "Special" vs. "Normal" Primer for Prop?

Quote:
Originally Posted by S/V Illusion View Post
Petit Zinc Coat Barnacle Barrier paint which is intended specifically for this purpose and has been found to be highly effective at minimizing growth on a prop.
But not S/s shafts

Pettit Zinc Coat Barnacle Barrier - Report - SailNet Community
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Old 22-05-2011, 20:10   #12
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Re: "Special" vs. "Normal" Primer for Prop?

Quote:
Originally Posted by Jim Cate View Post
So, it is sounding ok so far... anyone else??

I wonder if it is available in Oz? Hard to transport spray cans from the US to downunder in small batches.

Cheers,
Not quite the 97% zinc of pettit but it is in Australia
No, I have not used it

Zinc Dust Sacrificial Primer, Performance-Based
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