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Clear powder coat is indeed the 'best' if the part isnt subject to abrasion.
Old fashioned Lacquer will be too porous for bronze, even many many coats are vulnerable and usually are insufficient to keep out the formation of verdigris/acetates.
I use heavy coatings of clear urethane/acrylic catalyzed co-polymer, brushed on (at least 4 coats, flat sand with 400 grit, then flow on a final coating. Lasts about 4 years, but you have to inspect weekly after the coating to insure that you got all the possible pin-holes covered.
Any coating that is subject abrasion (hawse holes, cleats, etc.) wont last very long at all.
Best way to remove the green verdigris is either soaking with lemon juice or citric acid ..... a long soak - several hours, then sand with successively finer and finer grits, then power buff with jewelers rouge. If you want 'brown' bronze, rub on a mix of olive oil, a bit of mineral lime (the stuff used for soil conditioning not the stuff you put in a 'margarita' , and beeswax. This will take a few coatings to start the verdigris to begin to turn brown, then keep it waxed with beeswax.
Last edited by RichH; 07-19-2009 at 10:17 PM.