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19-04-2018, 10:44
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#16
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Writing Full-Time Since 2014
Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 9,559
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Re: bottom paint additive
Quote:
Originally Posted by Outlaw7
... But it was also TBT paint.
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That would explain it. I assumed it was post-TBT.
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19-04-2018, 11:19
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#17
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Registered User
Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 6,415
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Re: bottom paint additive
Quote:
Originally Posted by Outlaw7
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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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19-04-2018, 11:40
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#18
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Registered User
Join Date: Dec 2015
Location: Fort Pierce Fl
Boat: Gulfstar 36 MS
Posts: 210
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Re: bottom paint additive
Yes it worked, it was bad for the environment.
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19-04-2018, 12:14
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#19
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Registered User
Join Date: Jul 2015
Boat: Bruce Bingham Christina 49
Posts: 3,328
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Re: bottom paint additive
Quote:
Originally Posted by thinwater
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.
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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.
Bill O.
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23-04-2018, 09:20
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#20
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Registered User
Join Date: Dec 2015
Location: Fort Pierce Fl
Boat: Gulfstar 36 MS
Posts: 210
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Re: bottom paint additive
Bill O
Do you remember the ratio?
Thanks
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23-04-2018, 14:32
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#21
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Registered User
Join Date: Jul 2015
Boat: Bruce Bingham Christina 49
Posts: 3,328
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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.
Bill O.
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24-04-2018, 04:35
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#22
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Registered User
Join Date: Sep 2011
Location: Tarpon Springs fl
Boat: Morgan 384/ 1982
Posts: 378
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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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24-04-2018, 04:51
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#23
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Moderator
Join Date: Aug 2009
Location: Solent, England
Boat: Moody 31
Posts: 18,398
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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.
Pete
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24-04-2018, 06:40
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#24
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Writing Full-Time Since 2014
Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 9,559
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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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24-04-2018, 10:37
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#25
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Registered User
Join Date: Sep 2011
Location: Tarpon Springs fl
Boat: Morgan 384/ 1982
Posts: 378
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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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24-04-2018, 16:21
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#26
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Moderator and Certifiable Refitter
Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 20,242
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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).
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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24-03-2021, 10:08
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#27
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Registered User
Join Date: Aug 2009
Location: oriental
Boat: crowther trimaran 33
Posts: 4,414
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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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24-03-2021, 11:37
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#28
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Registered User
Join Date: Aug 2009
Location: oriental
Boat: crowther trimaran 33
Posts: 4,414
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Re: bottom paint additive
also Medetomidine
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25-03-2021, 04:36
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#29
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,082
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Re: bottom paint additive
Quote:
Originally Posted by seandepagnier
could someone (with experience) please tell me the effects of putting ivermectin in bottom paint?
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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.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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25-03-2021, 06:04
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#30
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Registered User
Join Date: Jul 2015
Boat: Bruce Bingham Christina 49
Posts: 3,328
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Re: bottom paint additive
Quote:
Originally Posted by GordMay
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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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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