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Copper Polishing

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  • TGTimm
    replied
    Well, it's been two months, so time to take a look at the test.

    Engine enamel first, then the wax:

    Click image for larger version

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    The Rustoleum Clear Engine enamel looks like it did when new. The Renaissance Wax has corroded a bit, but still looks better than bare copper polished two weeks ago. This is a really nasty location in the fermenter hall, where the copper is subject to acidic condensate, brewery cleaners and elevated CO2 levels.

    For keeping a kettle or the like looking good, I'd go with the Rustoleum Clear Engine Enamel, which is good to 500 degrees F.

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  • TGTimm
    replied
    Copper finishes

    I have to replace a couple of nipples on one of our washdown hose bibs today, so decided to do a little experiment.

    I made up the nipples from copper with soldered fitting. I then washed them in lye in our ultrasonic parts washer, rinsed, then another wash in dilute phos acid, again in the parts washer. This is an excellent cleaning regime for copper, brass, and nickel-plate. I then "polished" them with maroon ScotchBrite pads--not a fine polish, but mostly what we use around the brewery. I rinsed both with denatured alcohol to remove any metal dust and finger oils.

    I treated the one on the right with my Renaissance preservative wax; the one on the left got two coats of Rustoleum Clear Engine Enamel 500F. I cured the clear-coat at 225F for one hour.

    Click image for larger version

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    Not the best test, as one will be on the hot side and one on the cold. I'll put the clear-coated one on the hot (185F) side, and check back occasionally to see how the two different finishes perform.
    Last edited by TGTimm; 10-16-2019, 11:38 AM.

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  • liammckenna
    replied
    Originally posted by dick murton View Post
    Oh yes - yeast and conc. sulphuric acid (!!) for cleaning - varnish afterwards if you don't want to reclean every week. I like the idea of using high temperature waxes instead though.
    Thanks Dick.

    What approx. ratio of yeast to sulfuric acid? A gallon of yeast with a 1/4 pint of sulfuric? Would Sulfamic work too replacing the Sulfuric, I wonder? The breakdown products thereof are ammonia (effective at cleaning copper) and sulfite (which in an aqueous solution would be Sulfuric acid). Don't know. Won't try it yet, but...

    Much lower pKa than Sulfuric. Solid at room temp. Easily dissolved in water. I must seek out an inorganic chemist now....

    Pax.

    Liam

    Leave a comment:


  • Starcat
    replied
    10-4

    Originally posted by TGTimm View Post
    I should add that the reason I prefer a preservative wax to a clear-coat is that a clear-coat will fail in places, looking really ratty and requiring stripping the entire clear-coat off to refinish, whereas a wax will very gradually fail over time, but evenly, and is easily removed to refinish.
    Totally agree. I would never use clear coat for this duty.
    Wax can be reapplied as neeeded with no fuss.

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  • TGTimm
    replied
    I should add that the reason I prefer a preservative wax to a clear-coat is that a clear-coat will fail in places, looking really ratty and requiring stripping the entire clear-coat off to refinish, whereas a wax will very gradually fail over time, but evenly, and is easily removed to refinish.

    Leave a comment:


  • Starcat
    replied
    Excellent

    Originally posted by TGTimm View Post
    A good preservative wax will do wonders. My favorite is Renaissance wax. It ain't cheap, but it goes a long way.

    My go-to polish is Mother's Mag and Aluminum Wheel polish. Find it in the automotive dept. of your hardware store. I restore old Coleman lanterns and guns and this stuff just works, It also has some kind of wax in it, but it needs more. Used with 4-0 steel wool, it does an amazing job.

    [ATTACH]64559[/ATTACH]

    Just sayin'. Those looked more like charcoal briquettes when I started.
    Excellent Timm.
    Its interesting that Renaissance wax is Engineered from Petrol and Polymer components.
    The Flitz does contain some kind of wax, but I have not looked into the formula further.
    I am sure it may be augmented with this product.

    Leave a comment:


  • dick murton
    replied
    Looking at those brings back memories of all the lighting and cooking kit in my scout group being kerosene fired - just loved the hissing - I found the noise strangely relaxing. The lamps never looked as good as those though. All gas (or battery) now - the safety elves struck.

    Cheers

    Oh yes - yeast and conc. sulphuric acid (!!) for cleaning - varnish afterwards if you don't want to reclean every week. I like the idea of using high temperature waxes instead though.

    Leave a comment:


  • TGTimm
    replied
    A good preservative wax will do wonders. My favorite is Renaissance wax. It ain't cheap, but it goes a long way.

    My go-to polish is Mother's Mag and Aluminum Wheel polish. Find it in the automotive dept. of your hardware store. I restore old Coleman lanterns and guns and this stuff just works, It also has some kind of wax in it, but it needs more. Used with 4-0 steel wool, it does an amazing job.

    Click image for larger version

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    Just sayin'. Those looked more like charcoal briquettes when I started.

    Leave a comment:


  • Starcat
    replied
    Product

    Originally posted by Woody View Post
    I have a few copper clad tanks that are EXTREMELY tarnished. Whats the best polish out there for a quick shine? I've used an acid wash, and then tried buffing the tanks with cloth, but it goes back to green almost immediately. Any tricks I might be missing?
    What you need is something called " Flitz." It leaves a barrier on the surface and it works.

    Leave a comment:


  • Todd Hicks
    replied
    Wright's Brass Polish

    It will take time, but will polish up. The polish will cake up in crevases and trim, but you can work that out with a toothbrush. These tanks will tarnish back up in about a week unless they are varnished or polished with some sort of oil.

    Leave a comment:


  • Woody
    started a topic Copper Polishing

    Copper Polishing

    I have a few copper clad tanks that are EXTREMELY tarnished. Whats the best polish out there for a quick shine? I've used an acid wash, and then tried buffing the tanks with cloth, but it goes back to green almost immediately. Any tricks I might be missing?
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