A clear polyurethane sealer will protect the brass from oxygen exposure without causing discoloration. Apply a small amount of paint thinner to a soft cloth. Polish the brass with a mixture of lemon juice and salt. Paint a coating of polyurethane onto the brass with a paintbrush. Click to see full answer. Likewise, how do you stop brass from corroding?Combine salt with just enough lemon juice to make a paste. Dip a soft cloth into the paste and polish the brass. Alternatively, for stubborn tarnish, dip a rotary-head tool with a polishing head into the paste and apply it to the brass harware at medium speed.Likewise, can you clear coat brass? Brass trumpets are also coated with a transparent gold tinted metal lacquer. Whatever you use, CLEANING will have more determination on how long it lasts than anything. A speck of any contamination under the clear will cause a tarnish bloom under the clear coat. Thereof, what causes brass to tarnish? Brass jewelry is resistant to corrosion, so it does not rust. The reason for the tarnish is that brass is an alloy or copper and zinc, which will naturally tarnish when exposed to oxygen. Oils from your skin in addition to oxygen in the air accelerate tarnishing on your brass jewelry.Does WD 40 clean brass?All you need to do is coat the gold and brass lamp with a layer of WD-40, which is a great to clean brass and let it sit for about 15-30 minutes. Take a clean cloth and rub the lamp in circular motions drying and buffing it up. It will clean and polish brass and gold lamp and will make it shine bright as good as new.

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