Check your local paint store for "mildew additive" or something like that.
It's the same tri-butyl tin that used to be in boat paints. You can also add
Starbrite's compound X (tetracycline) and Cayenne pepper. I've added both to
my old dinghy paint formulations and they do work. I think I used about 1/2
oz cayenne per quart of paint. Mix it up in whatever carrier the paint uses
first (water or solvent).

--


Keith
__
Black holes suck!
"Akka" wrote in message
oups.com...
We're about to repaint the bottom of our 50' boat with an ablative
paint that, as far as we can tell, doesn't contain any biocide other
than the copper content (which is pretty low, about 25%). We'd buy a
better paint, but that's all we can get where our boat is, in Turkey.

Are there biocides that can be added to bottom paint to keep the slime
off? The ones used in commercial paints don't seem to be available by
themselves. We've heard of people using tetracycline and even chili
peppers, but don't know if there's any real data to support those, and
besides, don't have a clue how much to use. Any ideas?