Rick,
I decided to try your friend's suggestion, but with the veterinary
grade tetracycline since that is all that is available to us mere mortals who
are not M.D.s.
The stuff I bought from the local farm supply is 25% tetracycline by weight
and whatever makes up the rest of it is not mentioned on the packaging. I used
about a rounded teaspoon in a quart of VC17 and it seemed to work ok mix and
application wise but with one big problem. The veterinary stuff consists of
particles the size of fine sand, instead of the fine powder used in the gel
caps fit for humans. I should have ground it up into a fine powder first, but I
was in a hurry and not wearing my reading glasses. The result was as you might
expect from this description. The surface texture of paint with bits of fine
sand mixed in here and there. Live and learn, and a word to the wise. Make sure
that anything you add to paint is ground up super fine. Seems obvious I know,
but being in a hurry tends to make me stupid.
Steve Thomas
C&C27 MKIII
Port Stanley
P.S. Finally in the water, as of yesterday afternoon.
----- Original Message -----
From: Rick Brass via CnC-List
To: 'Jean-Francois J Rivard' ; [email protected]
Sent: Thursday, March 19, 2015 09:57
Subject: Re: Stus-List Bottom paint -ingredient change
A number of years ago, a friend who is a physician, and also the owner of a
big Cape Dory, gave me a bottle of Tetracycline antibiotic that was past its
expiration date and told me to mix it into my bottom paint. That’s what he said
he did for anti-slime additive, back in the days before paints with SR in the
name, when you had to pay the marina to put anti-slime additive in the paint.
Damn! My bottom was really clean between bottom paintings.
I have since been told that you can purchase antibiotics for use on horses
at many farm stores that cater to stables. I suppose it is not a good idea to
tell your local version of the EPA if you chose to do this. (And in case anyone
from the government is listening, I use Petit Ultima SR 60 on both my boats.)
Rick Brass
Washington, NC
From: CnC-List [mailto:[email protected]] On Behalf Of
Jean-Francois J Rivard via CnC-List
Sent: Thursday, March 19, 2015 9:03 AM
To: [email protected]
Subject: Stus-List Bottom paint -ingredient change
In Practical Sailor's tests" Irgarol has not been shown to extend the
active life of antifouling paints in our tests, and we’ve had a hard time
discerning any enhanced slime resistance in Irgarol-boosted paints after six
months in the water."
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