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Old 18-03-2015, 16:21   #16
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Re: Barnacle removal without scraping

Quote:
Originally Posted by Ironman162 View Post
I have one of those electronic gadgets from Jaycar with an electrode either end of the boat.
At first I thought it was a gimic but it works very well much to my surprise.
They come in kit form so you need to have a feel for electronics.
It repels barnacles and keeps the hull clean.
Do you have a link and any more details.
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Old 18-03-2015, 17:11   #17
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Re: Barnacle removal without scraping

If available a couple of weeks up a river in fresh water will clear lots of growth. Salt water stuff 'abandons ship'
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Old 18-03-2015, 18:48   #18
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Re: Barnacle removal without scraping

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Originally Posted by tomfl View Post
Do you have a link and any more details.

http://www.jaycar.com.au/Kits%2C-Sci...Boats/p/KC5498

Let me know if they work, maybe I'd buy one too!


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Old 18-03-2015, 18:54   #19
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Re: Barnacle removal without scraping

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Originally Posted by fisherman.ben View Post
or you can leave the boat in the water and use a pressure washer (yes, they do still work under water, I do it once a year on the commercial fishing boat I work on) use a 35 tip, close the sea cocks, put on the dive gear, keep it away from strainers and about a foot (or so) away from the boat and go to it. (just don't do it in the harbor, people don't seem to mind if you scrub the bottom with a carpet or brush, but some of them don't like the noise of the pressure washer.)
When you pressure wash bottom paint, quite a lot of it comes off. When they pressure wash my bottom on haul out, the runoff is visibly blue (or whatever colour the paint is). The yard has to put the runoff through a special filtration system. So what you are doing is putting lots of copper into the water, which is certainly irresponsible, and probably illegal. What's the name of the boat, btw?

It's people like you who are going to get copper bottom paint banned for the rest of us.
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Old 18-03-2015, 19:03   #20
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Re: Barnacle removal without scraping

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When you pressure wash bottom paint, quite a lot of it comes off. When they pressure wash my bottom on haul out, the runoff is visibly blue (or whatever colour the paint is). The yard has to put the runoff through a special filtration system. So what you are doing is putting lots of copper into the water, which is certainly irresponsible, and probably illegal. What's the name of the boat, btw?

It's idiots like you who are going to get copper bottom paint banned for the rest of us.

If you don't paint, it's fine to use a PW.
Much better than paint, but you have to do it.


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Old 18-03-2015, 19:27   #21
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Re: Barnacle removal without scraping

Most types of acid will remove barnacles. the shell they make is mostly Calcium. calcium is in the elements family called metal. Any of the ( iums) like magnesium or aluminum or titanium are metals and most are affected by acid. so it would probably behoove you to scrape them off instead of dissolving them. Mac
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Old 18-03-2015, 21:16   #22
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Re: Barnacle removal without scraping

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Time to beach the boat and clean the antifoul. Can barnacles be removed without scraping off? Is there any chemical (eg. bleach, Oxalic acid, etc) that will make them let go?
Not that I know of, but I'll share a secret with you.
Next time you antifoul, mix some 'Oxymav' in your antifoul, and
you'll get a few years barnacle free.

Bob1201
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Old 18-03-2015, 21:40   #23
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Re: Barnacle removal without scraping

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Originally Posted by Boatyarddog View Post
How do you keep yourself from being pushed away from the boat while in the water.
With the pressure from the washer, pushing you away.
I don't paint, just free scrape with a wetsuit, every 6 months.


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Part of the skill of an experienced diver using their fins. A suction device also helps.

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Old 18-03-2015, 22:00   #24
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Re: Barnacle removal without scraping

Hi all,
Do the electronic do-dads work on steel hulls?
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Old 18-03-2015, 22:21   #25
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Re: Barnacle removal without scraping

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Originally Posted by Bob1201 View Post
Next time you antifoul, mix some 'Oxymav' in your antifoul, and
you'll get a few years barnacle free.
Do you have a dosage recommendation, Bob?


You're adding Oxymav powder to antifouling, right? How many grams or ounces of powder to how many pints or litres of paint?


Gotta be two limits, a lower limit of effectiveness of the antibiotic and a higher limit of the powder disrupting paint adhesion. Not to mention an optimum cost/benefit point.


Al
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Old 19-03-2015, 02:03   #26
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Re: Barnacle removal without scraping

The original report from a chemist at Lake Tanganyika (?) was about a tablespoon/gallon.
I have personally used 250gms to roughly 30l of antifoul. Prior to this,
we did test strips of roughly a meter all over the butt of a Kong Halvo 44,
along with one A frame and one prop.
After a year, we pulled it out, and absolutely NOTHING on the test areas, but the normal on the rest.
So, next time, we put the Oxy on all over,(I think we used 250g to 20 l then) and after 3 years, we had to pull it out to do some other work ------- not a sign of ANY growth.
The Oxy is not that expensive, especially comparing the results, not to
mention the slipping fees, whatever they are worth these days. I've been
out of boat maintenance for years now, but hope to buy my own boat soon.
What will go on first - you got it - the same recipe. I used it on all my 'mates' boats, good results all round, but didn't spread the word as it
was my living at the time.
No problem of paint breakdown by the way ...
Hope this helps you out.
Bob
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Old 19-03-2015, 02:10   #27
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Re: Barnacle removal without scraping

Alan, I might add that you should get about 5 years with --- easy enough to jump over the side after 3 years, and check how it's going. The Oxy is now available on line, in my day I had a mate who was a chemist ---- Who,
may I say, said it wouldn't work
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Old 19-03-2015, 02:32   #28
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Re: Barnacle removal without scraping

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Originally Posted by Bob1201 View Post
Not that I know of, but I'll share a secret with you.
Next time you antifoul, mix some 'Oxymav' in your antifoul, and
you'll get a few years barnacle free.

Bob1201
Bob, what type of Oxymav are you talking about? I can see Oxymav B with composition Oxytetracycline hydrochloride 10 g/kg and Oxymav 100 Powder with Oxytetracycline Hydrochloride 100g/kg. I guess, Oxymav 100 is the proper one? Or you are talikng about pure Oxytetracycline Hydrochloride?
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Old 19-03-2015, 03:38   #29
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Re: Barnacle removal without scraping

Alan, to be honest, it was many years ago now, but I don't remember a 'B' on the label.
Go with the straight Oxymav.
Sorry to confuse you !
Bob
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Old 19-03-2015, 03:44   #30
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Re: Barnacle removal without scraping

Alan
It did come in 200gm plastic though, so my guess is Oxymav 100
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