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Thought I’d pass this along. This last haul-out I sprayed all
Silverheels’ underwater bronze – prop, prop shaft, shaft strut, intake
grates and thru-hull rims – with a few coats of Pettit Zinc Coat
Barnacle Barrier (WM #6077937). Then I painted over with International
copper-based, semi-ablative (“self-polishing”) antifouling. I was hoping
the paint would stick to the prop long enough to keep the barnacles at
bay during the weeks between launching and setting sail for the DR.
Imagine my surprise when, after arriving here, I dove on the bottom the
other day and saw all that paint still there after almost 7 weeks, 83
engine hours, and 1,400 n miles underway – even on the prop! Only the
prop’s sharp edge shows signs of paint wear. Pretty cool.Tor
Silverheels, P-424 #17
http://www.silverheels.us <http://www.silverheels.us/>
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Tor, at the yard we’ve been having really good results with the stuff as well. We are not putting anti fouling over top of barnacle barrier. Looking at the can, its nearly identical to the transducer paint they sell. Reading the ingredients I think it may very well be.
We are prepping the running gear and applying 3 coats of the barnacle barrier.Chuck
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Hi Chuck,
I’m amazed at the stuff, how well it retains the antifouling paint on
the propeller. I’m another 60-odd miles down the line and it’s still on
there, effectively anti-fouled. I wonder if I’d have the same result
with just the barnacle barrier without the antifouling over it.Tell me about transducer paint. I’ve never heard of it. Can you spray it
on an underwater transducer, like a depth sounder facing, without
harming the functionality? I have a bulbous thing on Silverheels’ bottom
that is a forward reading sonar. It came with the boat and it’s awesome.
Shows me the bottom depth ahead 50′ (or whatever I set it to) so I can
see if it’s shoaling. That’s already sprouting tiny barnacles because
it’s unpainted.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Pettit’s transducer paint comes in nearly and identical can. They both are epoxy based, I think that’s why they stick to prepped metal so well.
Clean the transducer and mask it off and spray on 2 or 3 coats. The can says no more than 3.
Don’t put any antifouling over top of it on the transducer.What brand unit do you have? We’ve installed a few of the interphase units. Pretty cool when you understand what you are looking at. It took me a few trips out to get the hang of reading the display.
The watermen down here were working a grant from the state to pull up ‘ghost pots’. The crab pots that are abandoned trap crabs and fish.
They rigged up a directional sensor on a pole and using a Hummingbird fish finder were able to see the pots using as side scanning. They guys said once they got the hang of what they were seeing they could tell if it was an old or new pot, even if it was coated or un-coated.Chuck
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Thanks for the info, Chuck. Wish I’d known about transducer paint a
couple of months ago. Oh, well, next time. I’ll bet if you called Pettit
and asked a tech guy there, they’d probably tell you the differences (if
any) between their tranducer paint and the barnacle barrier.My sonar is an Interphase. It looks ancient to me – I was surprised it
even worked when I bought the boat – but it has turned out to be my
primary depth sounder. The forward scan has surely spared me a few
bumps.That’s neat about the watermen, both the old traps retrieval program and
their fishfinder technique. I’d guess you’re talking about the
Chesapeake. Don’t believe I’ve heard the term “watermen” used anywhere
else.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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