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Author Topic: cloudy granite  (Read 1135 times)
arkansas
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« on: September 07, 2006, 08:57:21 PM »

I am new to granite work and i am having problems getting the stone to polish to a glossy shine.  I am working on a piece of tan brown granite.  I have a wet polisher and wet polishing pads.  While polishing the edge there are a few places where i got the polisher up on the top of the slab.  I have tried to polish these spots but everywere i work on it, the granite just looks cloudy after i get through. I start with the more coarse pads and work out to the buff pad just like i do on the edge but I can't seem to get it to polish and blend in with the rest of the top.  You can see exactly where i have been with the polisher.  What do you recommend.
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Mark D.
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« Reply #1 on: September 08, 2006, 08:04:42 AM »

I want to understand - are you top polishing? Or are you polishing where the bullnose comes to the top horizontal plane?

The cloudiness, is it a milky or a hazy type of cloudiness? If it is that is indicative of polishing over the deeper scratches instead of polishing them out. This is caused by not using the coarser pads enough. When you polish over those scratches you still get a gloss but it has a milky hue to it. Just repolish it from coarse and you will get the cloudiness out of it.

Since you are new to this, welcome to the trap of wet polishing. Everything being equal, that is that the dry pads and wet pads we are comparing are the same quality, wet polishing is faster and the pads will go farther. All in all it is more productive and that is why the stone shops polish wet. That being said, water enhances the stones color and hides scratches. Picture your sidewalk with a scratch in it. Now picture it 20 minutes after it has rained. Even though you know there is a scratch there it is not visible as the water has enhanced the sidewalk's color and turned it all into the same gray. It is the same with your granite. When you are done polishing you wipe off the stone and it has a nice shine, but the next morning when you look at it after it has had time to completely dry out you see a milky hue.

That being said, there are certain stones that are more difficult to get to a high luster polish than others. Usually denser granites like the blacks, and not all of them just  some veins of the stone that no matter how much you polish or whose pad you use it doesn't look milky but it does look hazy. On those stones we have found that by doing a final buff with a product like Dia-Glo from Abrasive Technology you can get that last "ummph" into you polish to finish with a high luster.
http://www.defusco.com/glues-epoxy-polyester-etc-stone-polish-c-82_508.html

If you have any questions, we can help.
Mark
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