Hi Barry,
polished black marble on a wall once restored and properly maintained will not need to be sealed.A sealer only does one thing protect the stone against true staining agents for a period of time. True stains will always be darker than the stone and etch marks will always be lighter than the stone. Black marble in an active public restroom could have the potential for lots of etching issues. Sealing with an impregnator will do nothing to help your customers situation.
Unless it is honed and you would like to color enhance the surface there isnt much you can do to protect it other than coat it in epoxy(you dont want to do that)
If you tell us what your customer wants to accomplish these guys and gals will offer you up some sound advice.  
If you want clarification on sealers just ask I bet you get a good amount of great replies.

On Sun, Aug 1, 2010 at 10:04 PM, Barry Raduta <barry@diamondstoneandtilecare.com> wrote:
i'll make the question simple; what sealer would you recommend?  water-based, poly or color enhancing?  i really don't understand the subtle differences between sealers and i would appreciate your collective help
thanks......barry


On Sun, Aug 1, 2010 at 3:15 PM, Fred Hueston <fhueston@gmail.com> wrote:
nope..wont provide any protection at all


On Sun, Aug 1, 2010 at 3:05 PM, <flooramor@aim.com> wrote:
Protection against what?

J
From: Barry Raduta <barry@diamondstoneandtilecare.com>
Date: Sun, 1 Aug 2010 15:04:19 -0400
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
ReplyTo: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Subject: [sccpartners] black marble/ color enhancing sealer?

Hi folks,

would you recommend using color enhancing sealer on a black marble wall in a public restroom after restoration.  would it provide the most protection in this type of environment?

thanks.......barry

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Thank You,
Barry V Raduta
Diamond Stone & Tile Care
215-816-7689

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Frederick M. Hueston PhD
www.stoneforensics.com
www.stoneandtilepros.com
Recommended stone care products  http://www.stonecarecentral.com/?Click=2149

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888-314-9077
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Thank You,
Barry V Raduta
Diamond Stone & Tile Care
215-816-7689

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Regards,
Stu Rosen
201-446-1200
www.mbstonecare.com
www.stoneshine.com
"A posse ad esse "