Hello James,
Five Years and getting dull-seems there could be more to the story. Improper cleaning solutions or maybe it is a buildup of the nine different cleaners and polishes they have under the sink.
We have had that happen and just had to give it a good cleaning/ stripping and get them on the right path. That's the easy one but if the stone has truly lost its luster you may need to hit it with diamonds and either finish it with crystallizer,tin oxide and steel wool or MB-20. Its one thing to do spot repairs on granite, another to do large areas like the 70 sq ft your talking about.
Addressing the dull areas and blending them may not be so easy if you need to use diamonds. If you haven't been polishing granite with diamonds I wouldn't recommend you start on someones counter top. Send some pictures in and give john a call before you get into this.
Easy enough to test it with MB-20  to see if you can get the gloss back. Not sure I would recommend doing this without getting more involved in granite polishing and you feel more comfortable.While an open mind is an admirable quality whats more powerful than sound judgement.
Make sure there are no topicals on the surface.
Use a hogs hair pad on a 5 " driver on your makita.
Place a half of teaspoon of MB-20  on an area you want to test.
Wet the product slightly with water.
Place the makita(set speed dial to 3) on product and spin slowly(using trigger control) to spread it over a small test area(5"x5")
Spread it out and increase the pressure and speed until you run the product dry. Check your results.You can build on the polish and repeat the process a second even third time.
Speed, pressure and amount of water are adjustable depending on the stone. If you get any swirls(you've used too much product) a clean pad and water will remove.  
On Mon, Feb 28, 2011 at 7:57 PM, Shane Chow <shane@loveyourstone.com> wrote:
i agree no diamonds make it easy,


On Mon, Feb 28, 2011 at 4:19 PM, Mike Marsoun <nulifesc@bigpond.com> wrote:
Use MB20, no butterflies and no diamonds if there are no scratches

Sent via BlackBerry® from Telstra

From: James Billeaudeau <james@diamondmarblepolishing.com>
Date: Mon, 28 Feb 2011 17:05:12 -0600
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
ReplyTo: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Subject: [sccpartners] Granite counter top polish job

Hi all,
 
Fixing to polish my first granite counter top.  It is black with multi-colored specks and has no scratches.  Just kind of dull on some areas, about 5 years old and never worked on before.  Owner just wants it to shine again.  Last polished granite at the Stone & Tile School last July and would appreciate a refresher as to the proceedure.  Have the basics down but have a few butterflies I'd appreciate you all getting rid of.  I have all the hand tools and the dark granite polishing powders, steel wool, etc.  Just don't quite remember how much to use.  Have a totol of 70 sq ft of counter top.  Thanks in advance for all the help.
 
James Billeaudeau
Diamond Marble Polishing
Lafayette, Louisiana

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Shane Chow
Stone Surface Specialists
7686 South 2325 East
Cottonwood Heights, UT 84121

(801) 856-0164 cell
(801) 930-9758 fax




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Regards,
Stu Rosen
201-446-1200
www.mbstonecare.com  " WORLD CLASS STONECARE PRODUCTS "
www.mbstone.com
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