We had a similar problem with brushed blue Bateig. Lots of discoloration after install. Plus it got rained on & took weeks to dry. They wanted us to seal it before grouting. 
We used a 50 grit nylon bristle brush doing a dry scrub and it looked new again. It made a lot of dust but it was outside so it didn't matter. 
Try It, it might workimage1.jpeg

Tony DeLuna
925-625-9625
www.PatriotStoneRestoration.com

On Nov 17, 2016, at 4:44 PM, Tony Warney <tony@excelstoneandtilecare.com> wrote:

Thanks Stu.


On Thu, Nov 17, 2016 at 4:34 PM, stuart rosen <mail@stoneshine.com> wrote:
Yes I am hearing about it more and more.
I don't think its the mortar-
Check the moisture-

On Thu, Nov 17, 2016 at 6:59 PM, Tony Warney <tony@excelstoneandtilecare.com> wrote:
Thanks Stu.
Cantera is used here more and more. It is from Mexico. They use it inside and outside.
The stone is very soft and porous. When grouting you must use a good quality grout release. We did the final restoration
of removing saw marks and cleaning on 6000 sf. The blotchy areas were only slightly noticeable after the first couple
of months. Now in a couple areas around the pool it is very noticeable. The stone is gray. Could the white mortar
be bleeding thru in a gray color?
Thanls

On Thu, Nov 17, 2016 at 3:33 PM, stuart rosen <mail@stoneshine.com> wrote:
Tony,
I am not familiar with that stone other than it is very porous.
I found this info regarding the stone-

"Volcanic/Canterra Stone also has special properties, its porosity and complex composition does not allow the stone to expand or contract in varying temperature and weather conditions. Furthermore, its porosity causes solar heat to be transferred to its interior causing a natural isolation. If used in outside walk ways, pool-decks, patios and drive ways the roughness causes a natural water no-slip surface preventing accidents around the pool. Finally its large silica content helps to reduce mildew or other fungi to be attached in its pores alleviating bleach and pressure cleaning over time.

So am guessing your stone is interior on grade installation.
My other guess is there is a moisture issue that is causing the blotchy-ness.
I would suggest that you use a moisture meter to determine if you have a moisture issue-
If you don't have one, I have a couple we loan out to folks-we can send it ups-you can test and send back.
Just let me know-


On Thu, Nov 17, 2016 at 5:31 PM, Tony Warney <tony@excelstoneandtilecare.com> wrote:
It was set in white. The spots are not collecting dirt. There are splotchy areas that appear to be the color of grout.
Grout release was used. We have cleaned the areas with a Turbo.


On Thu, Nov 17, 2016 at 7:13 AM, John Freitag <jfreitag@thestoneandtileschool.com> wrote:

Was this set in white or grey setting materials ? if grey then the setting materials maybe  coming through the stone. no fix that type of problem other than tear up and re-place.

If it grout haze that is collecting dirt then clean the floors good you may even need to hone to remove the grout that is collecting dirt making the surface appear the way it does.

 

 

John E Freitag

 

John E Freitag

Owner/Director

The Stone & Tile School

Office 407-567-7680

Cell 407-615-0134

 

 

schoollogo

 

www.thestoneandtileschool.com

 

 

 

From: sccpartners@stoneandtilepros.simplelists.com [mailto:sccpartners@stoneandtilepros.simplelists.com] On Behalf Of Tony Warney
Sent: Wednesday, November 16, 2016 9:13 PM
To: sccpartners@stoneandtilepros.simplelists.com
Subject: Cantera

 

This is a new installation (about 2-3 months). The longer it set more of the splotchy areas are starting to appear.

I think it is either grout or mortar bleeding thru the stone. The stone is about 1 inch thick.

What are your thoughts

--

Tony Warney

Excel Stone and Tile Care

 
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