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  #1  
Old 10-24-2005, 09:16 PM
G. Murdoch G. Murdoch is offline
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Finishing Marble

Greetings all, I just discovered this site through google. I've finished carving and sanding a marble sculpture down to 600 grit. Of course I sand wet. When the sculpture dries out I see so many microfractures and tiny scratches that are invisible when I'm wet sanding. My question is: Is there any way to seal the microfractures and fill in tiny scratches in the stone before proceeding to final finishing? What do you use for a high gloss finish on marble? I have used Zam on alabaster and carnuba wax on soapstone to good effect. The composition of this piece is such that I cannot reach all areas effectively with any felt or cloth buffing attachment for my foredom, so I need to use something that can be applied by hand. Any ideas?

Graham
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  #2  
Old 10-30-2005, 08:35 AM
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clifton clifton is offline
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Re: Finishing Marble

I don't know if this will be of any use to you ...
but, I use a clear coat.

The one I have used for quite a while now, for interior work, is Future floor wax. Apply it with a brush. One liberal coat, avoiding pools or drips.
Perhaps you could experiment with a piece of waste marble. I haven't used any exterior grade finishes.
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  #3  
Old 10-30-2005, 10:56 AM
jvc stone jvc stone is offline
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Re: Finishing Marble

I've used a little oxalic acid in the water for the final grit sanding. It works by melting the calcium carbonate and letting it flow a bit.(microscopic level) Usually go to about 1200, or 1500 grit wet/dry paper to get a good natural polish on the marble, 600 is basically a high honed finish.

JVC
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  #4  
Old 11-01-2005, 08:49 AM
G. Murdoch G. Murdoch is offline
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Re: Finishing Marble

Thanks for the feedback. I'll see if I can find any oxalic acid, and post some photos.
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  #5  
Old 11-17-2005, 05:33 AM
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clifton clifton is offline
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Re: Finishing Marble

Hi Graham,

you wrote:
"The composition of this piece is such that I cannot reach all areas effectively with any felt or cloth buffing attachment for my foredom, so I need to use something that can be applied by hand. Any ideas?"


I wondered if you have tried diamond pase for hard to reach areas. You can make tips, for the foredom, from 1/4" wood dowel or the 1/8" bamboo skewers and the paste comes in the different levels of grit.


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  #6  
Old 12-07-2005, 07:33 AM
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Cantab Cantab is offline
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Re: Finishing Marble

Just a thought: all scratces should be dealt with in the sanding process. I begin with 80 grit, then 140, 220(wet from here on), 320, 400, 600 and 800 (at least). This process, if the time commitment is made, should deal with all scratches. But, if the early stages are rushed, later stages can never make up for them.
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  #7  
Old 12-07-2005, 05:24 PM
G. Murdoch G. Murdoch is offline
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Re: Finishing Marble

Thanks all for the feedback. I ended up using a thin coat of stone sealer for tile floors. I followed that up with carnuba wax. The finished product I posted in the images gallery under the heading "Breathe & Wonder".

Graham
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  #8  
Old 06-24-2011, 06:39 PM
john mcdonald john mcdonald is offline
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Re: Finishing Marble

where can i get the oxalic acid ?
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  #9  
Old 06-24-2011, 11:10 PM
raspero raspero is offline
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Re: Finishing Marble

Paint stores. It's used to bleach wood decks.

Or:

http://shop.chemicalstore.com/naviga....asp?id=OX014D

Richard
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  #10  
Old 06-25-2011, 10:08 AM
chipfryer chipfryer is offline
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Re: Finishing Marble

This is a common problem when dealing with marble or granite, but more granite since, and of course granite is harder.

I liked one post here which made complete sense regarding bamboo and smaller tools. This is the way I would go.

The application of resins while they look good, and are a quick fix won't last that long, they will peel off eventually.

Natural materials breath in essence.
Hope this helps.
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  #11  
Old 10-12-2011, 11:54 PM
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GarryRicketson GarryRicketson is offline
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Re: Finishing Marble

Quote:
Of course I sand wet. When the sculpture dries out I see so many microfractures and tiny scratches that are invisible when I'm wet sanding.
Inspite of the traditional method, sanding wet, this is why do all my sanding dry, the water makes it look nice and shiney, but when it drys,..argg! it looks horrible,... I work dry, blow the dust away, and if there are any scratches, or places I missed, sand some more. The water covers evrything up, you can't
see where you need to sand,..
But then thats what a "clear coat" dose, too it makes it look all nice and shiney,
for a little while.
Following the correct grits, 80,120,180,220,280,320,400,600,800, and further if you so desire, is best, each grit finer, removes the "scartches" of the previous grit, but you have to be able to see them,..and then see them disappear.
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  #12  
Old 12-22-2011, 02:50 PM
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mantrid mantrid is offline
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Re: Finishing Marble

polishing is just the process of replacing large scratches with smaller scratches.

Oxalic acid can be obtained from brewer suppliers, used in wine making
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  #13  
Old 12-22-2011, 05:19 PM
Andrew Werby Andrew Werby is offline
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Re: Finishing Marble

Quote:
Originally Posted by mantrid View Post
polishing is just the process of replacing large scratches with smaller scratches.

[That's basically right, except that the acid technique of marble polishing dissolves that last layer of scratches.]

Oxalic acid can be obtained from brewer suppliers, used in wine making
[Sorry, but I make wine, and I've never seen oxalic acid sold for any wine-making purpose - tartaric acid, yes, or citric perhaps, but not oxalic. You might find oxalic acid in wine if you made it from rhubarb, but nobody (ouside of the UK) would ever do that...]

Andrew Werby
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  #14  
Old 02-19-2012, 12:29 PM
Wendicle Wendicle is offline
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Re: Finishing Marble

What kinds of power tools do you use for finishing marble?
I have a pneumatic dye grinder but that seems like overkill.
And I have a disc sander but that won't help with nooks and crannies.
Should I consider getting a foredom? Anybody use a dremel?
Also, is it dangerous to use an electric tool for wet sawing/sanding?
Wendy
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