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Post by MyNewHobby on Sept 5, 2009 13:47:44 GMT -5
Good Morning Kids! Yesterday I decided to ask my boss if he had any ideas about the pit polish issue. The man knows dam near everything. And ... as one that restores classic and antique Alfa Romeos and Jaguars, he has experienced a similar polish issue. He asked me what kind of polish we were using and I told him either aluminum oxide or cerium oxide. He explained that with the aluminum oxide, we needed to find something that worked against or ate aluminum. So he made two suggestions. The first suggestion was to use a really heavy duty degreaser. He gave me a gallon jug of his to take home and play with. The other option ... which I will try maybe later in the weekend will be to use (at his suggestion) Muriatic acid (pool acid). I am now on a four day time off and I think I will be able to find if either one of the two things works. Last night at around 5:30 pm, I started soaking these two pieces in the degreaser and checked them this morning, approximately 18 hours later. Here are the before shots .. AFTER ... As you can see .... some of the polish is gone on both pieces. The little crater on the green one, all the polish is gone. What do you think?
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Post by tkrueger3 on Sept 5, 2009 13:51:45 GMT -5
So, Julie! Tell us what degreaser you used. Looks like it might be an answer. And - gosh - there's a Pep Boys right down the street! ;D
Tom
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Post by MyNewHobby on Sept 5, 2009 14:24:28 GMT -5
I will do one better .... here is the jug. It is made by a company called Genlabs ... Chino California And the caution on the back of the bottle: Contains sodium metasilicate. " ... Do not use on soft metals such as aluminum, alloy, zinc, and copper."
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Post by tkrueger3 on Sept 5, 2009 15:19:05 GMT -5
Thanks, Julie. So you wouldn't want to use it on a stone that, for instance, gets it coloring from copper mineral, right? I'd guess it would pretty much destroy it. I will see can I find some of that around here, or something similar, with that particular chemical in it.
Thanks,
Tom
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Post by johnjsgems on Sept 5, 2009 18:30:16 GMT -5
Julie, I hate to be the one to say it but if you tumble the pits/crevices out you wouldn't have the problem. Either that or buy a cab machine and grind the defects out before tumbling. After you clean the pits you will have to fill them I assume and then sand and polish and....worth it?
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jayhkr
noticing nice landscape pebbles
Member since September 2007
Posts: 92
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Post by jayhkr on Sept 5, 2009 19:15:43 GMT -5
You know, thinking of degreasers, purple power is SUPER powerful when it comes to cleaning agents. I wonder if that would produce similar results. I'll be going out rock hunting in the next couple weeks so I if I get any with pits maybe I'll try a batch to see what can be done about it. Good idea here though!
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Post by MyNewHobby on Sept 5, 2009 19:31:17 GMT -5
John .... you are absolutely right ....
BUT
Some of the blemishes/cracks/pits in the rocks/stones are not always visible to the naked eye and it is only after the pictures that I see the polished pits or possible cracks.
But I do understand what you are saying.
If I were to run these/some of the stones/rocks until they are ultimately smooth .... there would be close to nothing left.
I wish I had the luxury of perfect stones/rocks ... and since I am so new to this ... I have to try to work with what I have.
As always ....
Without you John ... and others and their input ... I would not have a chance to make better batches ...
Thank You John ... REALLY!! I cannot do this without you ...
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carloscinco
fully equipped rock polisher
Member since July 2008
Posts: 1,639
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Post by carloscinco on Sept 5, 2009 21:30:15 GMT -5
Muriatic acid will cause nasty burns on people. It'll dissolve concrete. Caustic will dissolve aluminum and will cause even worse burns on people. Chemical burns like those caused by acids or caustic solutions can continue to damage tissue even after you think you've flushed them clean. Protect your eyes and skin and flush, flush, flush with plenty of water if you get some on you.
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