Actually, I used an impregnating color enhancing sealer on the slate, which eliminated (sort of)some of the older white spots. but then more were created when the people got water on the slate.  We went back in and used more of the sealer, which got rid of the spots again. But this could turn out to be a constant problem.  Maybe there is another type of sealer to use.  The color enhancing impregnating sealer provided the best results.  I also tested SCI counter top polish and some other things with more acrylic in them, but they were very streaky and splotchy because the stone is more porous in some places than others and absorbed at different rates.  Two much build up was not desireable either.<br>
B<br><br><div class="gmail_quote">On Thu, Oct 20, 2011 at 2:51 PM, Fred Hueston <span dir="ltr">&lt;<a target="_top" href="mailto:fhueston@gmail.com">fhueston@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
did you check the stone for moisture..It sounds like you could have a moisture problem. If thats the case the spots will continue to come back<div><div></div><div class="h5"><br><br><div class="gmail_quote">On Wed, Oct 19, 2011 at 6:43 PM, Baird Standish <span dir="ltr">&lt;<a target="_top" href="mailto:bairdstandish@gmail.com" target="_blank">bairdstandish@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi.  We recently touched up a blue-black slate counter that the owner had been treating with linseed oil. The linseed oil created a heavy build up, which we removed and then applied a color enhancing impregnating sealer.  The result was great.  However there were some white rings and spots that were in the stone (within the stone, not on the surface - like stun marks in marble).  After a couple of weeks the white spots are coming back and I am going to apply a little more of the impregnating sealer to see if that subdues them.  But I am wondering if there is some sort of treatment I can use on these little areas that will be more permanent and will not require constant touch up.<br>


Thanks much.<br>Baird<br clear="all"><br>-- <br>________________________________________<br>From the desk of<br>Baird Standish<br>Managing Partner<br>Facility Specialists, LLC<br>1616 Walnut St.<br>Philadelphia, PA 19103<br>


Phone: <a target="_top" href="tel:215-732-7505" value="+12157327505" target="_blank">215-732-7505</a><br>Fax: <a target="_top" href="tel:215-546-9160" value="+12155469160" target="_blank">215-546-9160</a><br>
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</blockquote></div><br><br clear="all"><div><br></div></div></div><font color="#888888">-- <br>Frederick M. Hueston PhD<br><a target="_top" href="http://www.stoneforensics.com" target="_blank">www.stoneforensics.com</a><br><a target="_top" href="http://www.stoneandtilepros.com" target="_blank">www.stoneandtilepros.com</a><br>

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</div></div></blockquote></div><br><br clear="all"><br>-- <br>________________________________________<br>From the desk of<br>Baird Standish<br>Managing Partner<br>Facility Specialists, LLC<br>1616 Walnut St.<br>Philadelphia, PA 19103<br>
Phone: 215-732-7505<br>Fax: 215-546-9160<br>