There is a clear acrylic varnish coating called INCRALAC which contains a
copper corrosion inhibitor (benzotriazole). It is more effective than most
coatings not containing an inhibitor but like everything else sooner or
later breaks down and has to be removed & renewed. I don't have a
recommended source but it is available from vendors catering to contractors
that work with polished brass and copper and also to art and artifact
conservator/restorers. We sometimes used it in the museum trade, and I
considered using it on my boat, but all in all prefer the less fuss and
bother & look of natural brownish patination. The trick is to avoid nasty
green-white corrosion -- more easily said than done -- but ocassional waxing
and buffing helps.

Scott
S/V Itchen

----- Original Message -----
From: "Keith"
Newsgroups: rec.boats.cruising,rec.boats.building,rec.boats
Sent: Wednesday, July 07, 2004 6:41 AM
Subject: exterior polished bronze coating???


Are you thinking about Imron? I've had reasonable success on brass bells
with about 10 coats of clear polyurethane, but they didn't have lines
rubbing against them all the time. I think that's what you're going to
find
is the real problem.

Personally, on the bell I have now, I polish once a week with 3M's metal
restorer and polish, which is like Flitz, etc. It's easier than trying to
remove all those coats of finish after about a year, when it'll start
tarnishing anyway.

BTW, best way to get rid of really bad tarnishing on brass or bronze is to
mix up 1 tablespoon of Citric acid (sour salt) per cup of hot water with a
couple of drops of dish detergent as a wetting agent. Soak until it turns
red. This will polish off easily, leaving you with some nice clean metal.

--


Keith
__
"A whim, once watered with imagination, becomes
a dream and the best time to take your first step toward a dream
is always yesterday; the worst time: tomorrow. Our best compromise
is today." - Alvah Simon
"Chris" wrote in message
m...
Hello and thank you in advance for your suggestions. I'm in the
process of refinishing my boat. The exterior Port lights and fairleads
are of solid bronze. I'm going to sand and polish to a bright finish
and need to coat with a urethane, or some other durable product that
will protect the polished finish and keep all gleaming and not turning
green. I once coated with a two part DuPont product (forget the name)
and it lasted for a reasonable time. I'm aware that there are new
products out there that will under these harsh conditions guarantee a
ten year protection but as yet have not located the company or
product.

Again this is an exterior project, often awash in sea water for days,
stepped on and lines rubbing constantly.
Any suggestions besides letting turn green and brasso every other
week???




"Chris" said
Hello and thank you in advance for your suggestions. I'm in the
process of refinishing my boat. The exterior Port lights and fairleads
are of solid bronze. I'm going to sand and polish to a bright finish
and need to coat with a urethane, or some other durable product that
will protect the polished finish SNIP
Any suggestions besides letting turn green and brasso every other
week???