We treat onyx like marble. Rounded sinks bowls we sand very raw and coat with polyaspartic coating. First picture is after hand sanding with a rough 40 grit sand paper. The other two picture are after completed at different angles. 
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On May 14, 2014, at 6:32 PM, Steve Kivinski <steve@potomacstonecare.com> wrote:

Hello Gang -- I have an onyx floor job and there is some severe issues. Wondering if anyone knew how difficult it is to grind down bad lippage on this stuff. Is it more like marble or granite or somewhere between? Thanks in advance for any insight. steve k
Potomac StoneCare Inc.


On Fri, Sep 21, 2012 at 7:08 AM, Fred Hueston <fhueston@gmail.com> wrote:
Yes, treat it like marble.

On Thu, Sep 20, 2012 at 5:47 PM, <kdasilva@marbledoctorstonecare.com> wrote:

To everyone,
We are doing a restoration job for an entire apartment in Manhattan and they have a onyx vanity and sink in one of the bathroom which have become dull and needs some facelift .
They were originally polished, but across time and use they have lost their
sheen. I have no experience with onyx. Does it polish like marble? Is it
hard like granite? I haven't the slightest idea. Any experience out
there polishing this stone? 

<sigimg1.png>
Kelly DaSilva
Project Manager
Installing, Repairing and Maintaining of Natural Stone and Other Man Made Solid Surfaces in Both Commercial and Residential Settings. Serving the Tristate since 1996'
CT Office :289 White ST
Danbury CT - 06810
NY Office: 244 5th Avenue,Suite 2608 New York, NY 10001 (212)726-2518




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