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Unread 09-25-2014, 08:09 PM   #1
figaro
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Polishing Marble

I bullnosed some carrera marble using a profile wheel then wet polishing starting with 100 all the way to 6000 but am not getting the gloss sheen to match the rest of the tile. I have a "buff" pad in my polishing pad kit but it is black and just leaves black marks. I don't have a lot of experience with this. What next step/method do I need to take at this point to get it glossier. Thanks
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Unread 09-25-2014, 08:50 PM   #2
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Carrara is pretty soft, I would normally start with maybe a 220 and go up. How course is your profile wheel?

When you say its not glossy enough does it have deep scratches when you are done or is it just dull looking? In either case you may not be spending long enough somewhere in your process. How are you checking your progress as you go? blowing air from a compressor is a good way to dry it off fast and see how you are progressing.

How big a jump are you taking between grits? If they are to big that could be a problem...

You need to get a buffing wheel and some white wax for lighter colored stones. Black wax on light stones is no good
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Unread 09-25-2014, 10:08 PM   #3
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Figaro, I'll move you over here where more of our stoners usually hang out.

If you'll type polishing into the Advanced Search feature and ask for Titles you'll find lots of discussion on stone polishing to get you started.
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Unread 09-25-2014, 10:19 PM   #4
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When I finished polishing the round over, all the way up to 6000 grit, I could see a difference in the sheen where I was polishing the round over and the face of the polished marble. So I backed off and started over, not skipping any grits. 100, 200, 400, 800, 1500, 3000, 6000. I try to be thorough, I guess I expect the 6000 to be as polished as the polished face of the tile but maybe i'm wrong. I'm using a wet polisher with diamond pads. I bought them off af e-bay a while back. Maybe they're just cheap and inefficient. I see people using dry pads and am wondering how effective they would be for this.
Thanks
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Unread 09-25-2014, 10:22 PM   #5
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Thanks cx. I did do a search but didn't really find anything that would help me, but i'll look again.
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Unread 09-25-2014, 10:46 PM   #6
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Might try the Liberry under Bullnose, too. Some youtubes linked in there. No idea how useful they might be.
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Unread 09-26-2014, 09:37 AM   #7
doitright
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Hi Figaro

There is no reason you should ever have to go over 3,000 - 3,500 grit wet diamond pad to polish marble.

Since your pads go up to 6,000 grit, I presume they may be intended for granite. The difference is in the composition of the pad, just like a diamond saw blade. Not all are created equal.

I have had great success dry polishing with Alpha Velcro backed sandpaper. The key is to get all the original saw marks/deep scratches out on the initial pass. Anything left behind will not come out on successive grits. With every grit you advance you will create a new scratch pattern. That must be even before proceeding.

The benefits of sandpaper is the aluminum oxide or carborundum will start to wear down and clog and automatically start moving toward the next higher grit, thus polishing the stone earlier. It is not uncommon to achieve a high polish with a 360 grit sandpaper (Alpha).

They (Alpha) are sold in boxes of each independent grit, or a variety pack (which I recommend for beginners) in either 4" or 5'' diameters. I use them on my Makita 9227C, but have even started basic shaping and scratch removal with a palm sander (with wet/dry sandpaper).

If you don't want to try the dry method, try changing your wet pads to a brand such as Abrasive Technologies for marble.
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Unread 09-26-2014, 10:37 AM   #8
figaro
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Thanks doitright, I'm at job now and just tried it again and the best I can get is a satin finish even going all the way to 6000. I understand the concept of not skipping grits and working your way up but still don't understand my problem. think I've just got cheap pads it shouldn't be this difficult. Some of the pads I'm using are brand new. I would love to get set up with a dry system and think I will take your advice on products. Thanks
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Unread 10-01-2014, 04:30 PM   #9
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I don't think you'll have any luck with dry pads on Carrara, it doesn't handle the heat and friction very well.

Honestly, if you're almost there, but just need that extra pop, you can do it by hand. We do it in the shop all the time. Get a rag and soak it in water, then wring it out completely so it's damp. Fold it into 4 layers so it's nice and thick/soft. Put some marble polishing powder on there (I think just about any one of them will work like this) and contour the rag around the bullnose. Rub aggressively in a linear pattern along the bullnose, taking care not to get any up on the face.
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Unread 10-05-2014, 10:29 AM   #10
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Hi Cameron

I agree that the dry diamond pads may not work, I disagree about using sandpaper. I've had great success over the years with this method myself.

I also agree that the marble polishing compound may be all that is needed to "pop" the shine. It's also possible that if poor quality pads with the wrong matrix were used, the "pop" gained from using the marble polishing compound may not produce a factory shine for lack of clarity.
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Unread 04-27-2016, 12:39 PM   #11
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Sorry to drag up an old thread but....

With Carrara what sort of speeds RPM would you usually use to achieve a good bullnose edge finish?

I've picked up that 200 trough to 3500 grit pads should achieve a good finish with possibly a compound to gain extra pop?
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Unread 04-27-2016, 03:48 PM   #12
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Hi Kevin

Do not exceed 2,000 rpm.

You'd be surprised how much shaping and polishing you can do with sandpaper.

A marble polishing compound will always help "pop" the final shine.
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Unread 04-27-2016, 04:21 PM   #13
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Yeah I agree with Cam and John-I might add if its too much to do by hand use a flexible backer 4 inches and a hogs hair pad with a good acidic polishing compound.Work the pad around the bullnose-you dont need a lot of water.
Once your pad is loaded with compound the polishing will become easier.
Run the diamonds up to a point where you see some sheen if possible then polish.
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Unread 04-28-2016, 11:06 AM   #14
Montolit
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Thanks guys.!

I used to own a Flex 12-3 100 wet but ended up selling it on as it sat doing nothing for so long, but im now needing another machine...

Have been looking at just gettin the same Flex machine:

https://www.flex-tools.com/gb/Produk..._WET/index.php

Or trying a Makita instead:

http://www.makitauk.com/products/con...-polisher.html

Makita seem to get good reviews these days?

Alternatively, there are budget wet polishers on ebay that go from 900 to 2950 RPM:

http://pages.ebay.com/link/?nav=item...obalID=EBAY-GB
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Last edited by Montolit; 04-28-2016 at 12:34 PM. Reason: Additional link
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