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Old 14-08-2011, 11:52   #1
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Boat: Egg Harbor sedan cruiser 1970
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New Style Antifouling Paints

any more info on trials?
fungus extract kills repels barnacles
Fungus in hull paint may solve barnacle problem

a slick nano tech coating
Barnacle-busting paint makes ships' voyages greener | Science | The Observer

a coating the entraps a layer of air so the surface never gets wet
New Super-Hydrophobic Material Could Revolutionize the Water Repellent Market - Associated Content from Yahoo! -

Barnacle gene sheds light on foul behaviour - The Naked Scientists
When free-swimming barnacle larvae encounter medetomidine it makes them hyperactive, kicking their legs and wriggling about so they donít settle down and turn into adults. When they swim off, the effect reverses, so the larvae happily move off to settle elsewhere.
the biocide Econea
Latitude 38 - 'Lectronic Latitude

I am partial to whatever is most effective for the cheapest price. I kind of like the medetomide drug paint

How long before we can move on to one of these new bottom antifouls?

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Old 14-08-2011, 11:58   #2
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Re: new style antifoul paints

medetomidine and barnacle search led to this

Working with medetomidine concentrations as low as 0.025 % wt
low amount needed sounds ideal.
Results - Mistra [NS4 version]

1. Efficacy of medetomidine
Working with medetomidine concentrations as low as 0.025 % wt. in the paint prevent barnacle fouling. Moreover, field tests have also verified that the efficacy remains for multi-season tests. Thus far, panels have been tested for 24 months with remaining efficacy. Field tests have also demonstrated that medetomidine is effective against three species of barnacles and one type of tube-forming polychaete.

2. Mode of action

It was found that the barnacle responded to the presence of medetomidine by increased leg movement leading to difficulties in adhering to the surface. All cells in an organism are connected by different communication systems, either neuronal or by circulating hormones. The signal molecules, neurotransmitters or hormones, act through binding to a specific protein on the cell surface, the receptor. The receptor then transports the signal from the outside of the cell to the inside, inducing a biological response. One class of receptors on the cell surface is the G-protein coupled receptors (GPCRs) and we have found it to be a so-called octopamine receptor that binds the antifouling substance medetomidine.
The first hypothesis regarding mode of action was that medetomidine inhibited cement secretion. The reasoning behind this was that if no cement (adhesive proteins) was secreted, it would be impossible for the barnacle cyprid larva to settle. This hypothesis was disproved and instead, an increase in motility was seen while adding medetomidine. A barnacle cyprid larva can swim as fast as 1 mm/s or twice its length each second, which is better than corresponding swimming records for humans. With such a swimming speed, the exploratory surface behaviour necessary for settlement of the barnacle cyprid larva is effectively blocked. Thereby a deterrent behaviour is promoted and the attachment and permanent settlement is inhibited.

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Old 14-08-2011, 12:12   #3
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Re: New Style Antifouling Paints

Thanks for the interesting research reports. There always seems to be new tricks in the works for the barnacle problem. It will be great news when a plan arrives without negative ecological side effects and without prohibitive costs. The solution seems to always be just a step away.
Take care and joy, Aythya crew
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Old 14-08-2011, 12:24   #4
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Re: New Style Antifouling Paints

medetomidine make barnacle swim so fast it does not take the time to settle on the surface. so they are not killed or harmed.

it is way past time for a new highly effective cheap environmentally friendly antifoul paint.
listen someone is always going to find something wrong with everything somewhere. like milk causes cancer etc... agendas, I would not doubt driven by competeing forces from various companies, industrial sabotages come to mind, the kind that play out in the hearts and minds, which are not based on truth just innuendo,lies, outrageous claims. We might find something great, then some one will claim some devastating consequence. The artificial sweetener market with all its competing sweeteners play out like this.
cyclamates were proven to not be carcinogens yet are still banned in the usa
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