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Lee Jerry · 24-03-2023, 07:38

Quote:

Originally Posted by Franziska

So, we'll see.

I will get enough of that diver applicable paint delivered, they even offer it as a free testing sample.
So, I'll report back unbiased (!) here in a few months how it holds up.

In the best case it works reasonably good by itself, if that is not the case but it will make cleaning easier its still good. In the worst case it's just another layer of paint at the keel soles which does not harm.

Essentially we really have nothing to loose in this case and might safe on the lifting operation.

Thanks everyone for their contributions.

Maybe also apply to a little section on the side and/or waterline of the boat (that might see a little more growth) as an additional test?

Can you say what company?

Franziska · 24-03-2023, 08:08

Quote:

Originally Posted by Lee Jerry

Maybe also apply to a little section on the side and/or waterline of the boat (that might see a little more growth) as an additional test?

Can you say what company?

Company name, not for now.

Regarding the sample higher up, unfortunately neither, I just applied fresh antifouling everywhere else.

The new stuff goes on the bottom of the keels. But, it will be right next to high quality antifouling which has been applied this week.
So we will see how it performs.

thinwater · 24-03-2023, 09:01

A few videos of how it is applied. Note that these are ALL 2-part epoxy products intended for underwater application. I do not know of any other product class that can be used underwater. I have worked with and tested underwater epoxies, and they can be pretty good. But getting them to stick is a little more difficult and surface prep is more difficult.

https://youtu.be/yWp5PwqxGvA

https://www.google.com/search?client...id:WsMViEz-z64

https://youtu.be/T8f9bPfJgGw

fstbttms · 24-03-2023, 09:17

Quote:

Originally Posted by double u

years ago a friend of ours swore that underwater "application" of AF is possible & he had done it before.

I know of an underwater-applicable anti fouling paint currently being tested in New York and Florida. The inventor claims good performance.

**Pete7** · 24-03-2023, 10:04

Quote:

Originally Posted by boatman61

Colour match..

Indeed, how could you ever go into the yacht club marina with different colour antifouling, that would be a dreadful faux pas

Franziska · 24-03-2023, 10:20

Quote:

Originally Posted by Pete7

Indeed, how could you ever go into the yacht club marina with different colour antifouling, that would be a dreadful faux pas

LOL.
Simple, anchor and do not go into marinas, just what we do.[emoji6]

Still the underwater paint is black too, so it matches the other antifouling we have [emoji846]

Franziska · 24-03-2023, 10:37

Quote:

Originally Posted by thinwater

A few videos of how it is applied. Note that these are ALL 2-part epoxy products intended for underwater application. I do not know of any other product class that can be used underwater. I have worked with and tested underwater epoxies, and they can be pretty good. But getting them to stick is a little more difficult and surface prep is more difficult.

https://youtu.be/yWp5PwqxGvA

https://www.google.com/search?client...id:WsMViEz-z64

https://youtu.be/T8f9bPfJgGw

Different product & manufacturer, but still very informative. Thank you!!

**s/v Jedi** · 24-03-2023, 14:44

Quote:

Originally Posted by Franziska

The company I am in contact with does actually produce a paint, which is applied by divers as corrosion protection coating to underwater structures.
I found quite a number of these underwater applicable coatings from different brands. They seem to be not that uncommon.

It's the antifouling properties which they say have been added which are the novelty.

Sounds good! Mix in some TBT and we have the perfect diy no-haulout antifouling!

*seeking cover*

AKA-None · 24-03-2023, 17:08

Well as we are talking about cats

Paint one hull and put ultrasonic transducers on the other

Perfect test bed

Chris Cringle · 25-03-2023, 13:34

Quote:

Originally Posted by fstbttms

Not really. Anti fouling paint works by allowing water to penetrate its matrix, thereby allowing its biocide to be released. By encasing it in a waterproof epoxy (or whatever), you eliminate its anti fouling properties.

Well, as I recall, the epoxy “patches” did not accumulate marine growth. So…….whatever……

AKA-None · 25-03-2023, 21:42

Quote:

Originally Posted by Chris Cringle

Well, as I recall, the epoxy “patches” did not accumulate marine growth. So…….whatever……

So then the best thing to do is just paint the bottom with epoxy like in the patches?

Is that what you mean

Captain Bill · 26-03-2023, 06:37

Lanocote makes a product called Prop and Bottom. Basically it is a lanolin based grease. I've had some luck with it on my props and it can be applied underwater. The only thing is that the surface you are applying it to must be completely clean of any slime layer or it won't stick. I've only used it on my props and you really have to use a scotch bright pad to clean the prop or it won't stick at all under water. I find it's good for about three months. It lasts at least two years if you are not using the boat. I had a friend who put it on his prop and running gear and let the boat sit for 2 years in pretty heavy fouling waters. He had the boat hauled before putting the boat back in service and there was nothing growing on anywhere treated with the Lanocote. His hard bottom paint had not been nearly as effective after sitting for 2 years. The only real downside other than having to reapply it so often is it smells like sheep.

fstbttms · 26-03-2023, 07:20

Quote:

Originally Posted by Captain Bill

Lanocote makes a product called Prop and Bottom. Basically it is a lanolin based grease. I've had some luck with it on my props and it can be applied underwater. The only thing is that the surface you are applying it to must be completely clean of any slime layer or it won't stick.

I tried it once when it first came to market. In cool water (low 60s) it wouldn’t spread. That made it useless to me.

rslifkin · 26-03-2023, 07:48

Thinking about the bottom paint mixed into epoxy thing, I'd expect it to work for a little while, but once the bit of biocide exposed at the surface is depleted, it'll have no antifouling properties (as the water can't get to the rest of the biocide through the epoxy).