Pretty well any spar varnish will work for a while, as it does on wood. However, it's just the nature of varnish that it doesn't last for ever, because it is clear, letting the harmful UV rays through. So, just varnish your brass, but be prepared to do it every year as part of your annual maintenance schedule.
Peter.
It's a good idea. Will it work in the heated environment of an engine room too? I'm thinking of the copper piping in an old RNLI boat and likewise the binnacle.
I guess it comes off ready for polish and new coat with varnish remover?
Do you have someone in the crew cabin to keep this up whilst you are away? A few weeks away from the boat, at least in the UK, means you need to start from scratch each time. I got to the point of just leaving it, and then working like hell ahead of a festival or a special occasion.
Most of my portlights are chromed, but the few that are plain brass, about eight of them, are polished every two weeks, they are fine. If you leave it too long, it does take for ever! I do have a crew chap, because it's cheaper to pay him for a year, than put my boat in a marina every two weeks, when I'm away, plus of course he works on the boat when I'm away and when I'm home, nice to be waited on.
That's the way to do it, Gentleman Yachtsman. I once purchased a 63 footer in Northern Ireland and my sea trial was from there to Buckie via the Caledonian. My host the owner had an elderly fisherman as his "man" who did all the jobs around the boat including turning out very respectable nosh.
My lad couldn't cook to save his life, still burns frozen beefburgers, 27 years old!! I do the cooking! But also eat out a fair amount, it's cheaper than cooking, down here in the meddy, for one anyway. once I'm aboard on my own, I will not have a crew, it then becomes expensive.
You could try plating the binnacle with gold, which doesn't tarnish and has a nice "rich" colour! It's not as expensive as one might think, because the layer is so thin.
Peter.
I asked this question last year and somebody said you should polish it up as best you can then protect it with furniture polish, not perfect but the shine lasts a long longer. Haven't tried it yet but got some furniture polish in my bag for the weekend.
I use a product, but don’t know its trade name. It is the same product used in the final painting of north American car licence plates. Should be easy to track down if you’re really interested.
Initial application is with a brush and then baked at 400 degrees F for ½ hour. Sounds like a cake recipe!
Its kept the tarnish of my brass work in a salt water environment for several years and has not discoloured.