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Old 19-04-2018, 10:44   #16
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Re: bottom paint additive

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... But it was also TBT paint.
That would explain it. I assumed it was post-TBT.
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Old 19-04-2018, 11:19   #17
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Re: bottom paint additive

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The Virgin Islands, the Bahamas and the Keys call it what you will. But it was also TBT paint.
Ah the good old days of effective TBT antifouling. I'd almost give up my Iphone, Ipad and sliced bread if it would bring back TBT antifouling (just kidding folks, I'm actually a closet greeny)
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Old 19-04-2018, 11:40   #18
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Re: bottom paint additive

Yes it worked, it was bad for the environment.
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Old 19-04-2018, 12:14   #19
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Re: bottom paint additive

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Starbrite "Compound X." It was pulled after several research papers showed that it didn't do anything. They also tested straight tetracycline. It was just a fad.
I've never seen any research papers that showed Compound X (oxytetracycline hydrochloride) didn't work. Please send them to me, I would like to read them. The only paper I've seen is Petersen 1993 and it wasn't done that well. Currently there any many anti-fouling ships paints with antimicrobial agents from natural sources Similarly, the family of antibotics "Tetracyclines" are also a naturally derived products.

Here is an old CW write up on Compound X

One real reason that I found why you don't see it on shelves any more (besides a slow seller) is they didn't pay for their EPA registration renewal in 2005. In a final consent decree in 2013, the company was levied a fine and the product hasn't been on the shelves since.

Maybe anecdotal, but I've added it to Trinidad and consistently got 6 years of good anti-fouling out of it. Also found in an old CF post
see #27 http://www.cruisersforum.com/forums/...l-11553-2.html for someone else that like it.

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Old 23-04-2018, 09:20   #20
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Re: bottom paint additive

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Do you remember the ratio?
Thanks
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Old 23-04-2018, 14:32   #21
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Re: bottom paint additive

In the patent they described the material as only 21.5% OT-HCl and 78.4% inert ingredients. They sold 10g units that were to be added to a gal. of bottom paint.

Based on the purity of the material you would adjust the amount added to a gal. to match their original formulation. For example, if it was 99% pure, then you would only need 2.17g/gal (~2 g/gal).

Before adding it to the paint mix it in a min. amount of either denatured ethanol or methanol (Heet antifreeze automotive fuel additive) then mix thoroughly into paint.

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Old 24-04-2018, 04:35   #22
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Re: bottom paint additive

So i learned that Copper powder (19 dollars a pound at Amazon) can be added to bottom paint . So how many pounds per per gallon ?. I sure miss the TBT days ! I use Sea Hawk Tropic 2 gallons on 38 ft . In the river here in florida 1/2 salt 1/2fresh water depending on in coming or out going tide. I get two years than i need a diver every month at 75 a month !
I have given up on the idea of Cyanine pepper as a additive. !
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Old 24-04-2018, 04:51   #23
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Re: bottom paint additive

VC Offshore paint comes with a little bag of copper dust for you to add just before painting. The bag weighs about 1lb and goes into 2 litres of paint. However, I recon its a gimmick because the paint isn't very good at anything and copper dust or particles aren't what is needed. You need copper oxide not shinny bits of copper dust.

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Old 24-04-2018, 06:40   #24
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Re: bottom paint additive

Test your theories. I't easy and cheap
  • Get sheet of fiberglass from Home Depot
  • Divide it into rectangles with tape and paint each with a recipe. One must be a control using paint straight from the can.
  • Hang this under the dock, floating from a length of sealed 2" PVC pipe.
  • Post pictures at 1-5 years.
Other wise we're just wasting money and time. I've done this with paints and to test cleaning methods. It's not hard.
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Old 24-04-2018, 10:37   #25
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Re: bottom paint additive

seems like Amazon has Cuprous oxide listed for 78 dollars a bag 1kg
How much do you figure is a good amount to add to a gallon of bottom paint ! ?
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Old 24-04-2018, 16:21   #26
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Re: bottom paint additive

Some copper chemistry is in order here

Pure copper reacts with sea water to form cuprous oxide (the stuff that deters marine growth).

After some time (weeks / months?) this degrades further to become cupric hydrochloride. Being unstable, this washes away (unless held by the matrix - paint, epoxy etc).
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Old 24-03-2021, 10:08   #27
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Re: bottom paint additive

could someone (with experience) please tell me the effects of putting ivermectin in bottom paint?
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Old 24-03-2021, 11:37   #28
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Re: bottom paint additive

also Medetomidine
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Old 25-03-2021, 04:36   #29
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Re: bottom paint additive

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could someone (with experience) please tell me the effects of putting ivermectin in bottom paint?
Yes, your barnacles would be much less likely to develop head lice or rosacea.
On a wooden hull, your ship worms might not get strongyloidiasis or onchocerciasis.
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Old 25-03-2021, 06:04   #30
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Re: bottom paint additive

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Yes, your barnacles would be much less likely to develop head lice or rosacea.
On a wooden hull, your ship worms might not get strongyloidiasis or onchocerciasis.

Both ivermectin and medetomidine (and others) have been tested for their antifouling capabilites and are part of the list of prime candidates for replacing copper as a biocide in bottom paints. It will happen.
Some manufacturers (like Pettit/Trinidad) over the years have been slowly reducing the copper content in their bottom paints and they have become less effective in reducing hull fouling. It would be nice if they added tested bio-agents that would make their bottom paints work better again. (Irgarol in the Trini SR from my observations is basically useless)
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