On Tue, 15 Apr 2008 21:01:13 +1000, Herodotus
wrote:

Greetings Bruce,
I use Jotan and merely add between 5 to 10% TBT - usually 5%. I was
told not to use more than 10 percent as it will affect the drying and
adhesion of the antifouling. It works well for me. Of course some of
the problems people may have experienced may have been applying the
wrong anitfouling ove and existing layer. I know when I started using
Jotan in Malaysia instead of ABC-3, I had to sand back hard and apply
a Jotan primer coat. - But you and they would have thought of that
aspect.

cheers
Peter


I've been leaning that way. Met a fella today who's mate painted boats
for some years and he makes about the same recommendation you do.

I'm beginning to think that the people that had problems were using
too much TBT as much as 10% by volume, or more.

the more research I do the lower down the scale the TBT addition seems
to be. Right now I'm getting recommendations between 3 - 5 % and not
more.

I must have the remnants of 15 years of anti fouling on the bottom so
this time I';m going to scrape it all off, prime and a tie coat and a
couple of coats of bottom paint. Probably be 5 knots faster :-)



Bruce-in-Bangkok
(correct email address for reply)

"Bruce in Bangkok" wrote in message
...
I must have the remnants of 15 years of anti fouling on the bottom so
this time I';m going to scrape it all off, prime and a tie coat and a
couple of coats of bottom paint. Probably be 5 knots faster :-)

You make it sound simple but I have taken all the a/f off a 34' boat and it
is not an experience I ever plan to repeat.
I used a paint remover that was guaranteed not to harm fibreglass and it did
not , but this meant it was not all that brilliant at dissolving paint
either.
It left behind some thin residues which I washed off with the thinners
appropriate to the a/f. We used a lot of it and although the job was done in
the open air we were seriously affected by the fumes.
Get a (really) experienced professional firm to sand blast it off in
controlled conditions. .

On Tue, 15 Apr 2008 18:32:44 +0200, "Edgar"
wrote:


"Bruce in Bangkok" wrote in message
.. .
I must have the remnants of 15 years of anti fouling on the bottom so
this time I';m going to scrape it all off, prime and a tie coat and a
couple of coats of bottom paint. Probably be 5 knots faster :-)

You make it sound simple but I have taken all the a/f off a 34' boat and it
is not an experience I ever plan to repeat.
I used a paint remover that was guaranteed not to harm fibreglass and it did
not , but this meant it was not all that brilliant at dissolving paint
either.
It left behind some thin residues which I washed off with the thinners
appropriate to the a/f. We used a lot of it and although the job was done in
the open air we were seriously affected by the fumes.
Get a (really) experienced professional firm to sand blast it off in
controlled conditions. .


One of the great advantages of living in 3rd third world nation is we
have people who are virtually slaves. Paid, but very cheaply paid. And
the best part of it is that any wage that they will work for me is at
least double what they would be working for if they were home.

As an example I can hire a Thai girl to wash my boat for ten US dollar
a day, and she is happy to get it because if she works on a local
construction crew she will be making $5.00. If I get illegal Burmese
workers cut those numbers at least in half.

So we will scrape the paint off the bottom carefully down to the
gelcoat or epoxy and then sand, prime, tie coat and anti foul.


Bruce-in-Bangkok
(correct email address for reply)