Sparks is the company and sigma is the sealer. I use it on all slate, flagstone and Saltillo patios. One coat will is usually enough

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On Aug 9, 2013, at 12:35 PM, Baird Standish <bairdstandish@gmail.com> wrote:

> Hi. We have been helping out another contractor remove ferrous oxide deposits on a flagstone patio. He acid cleaned, neutralized and left the patio clean except for yellow deposits. We tested with iron out (and some rs2000 which tested purple). Test are came out clean but the owners would like to color enhance a little. So was wondering what product might provide a mild color enhancement without sealing (want to let stones breath). I believe it was sealed many moons ago, which probably caused the ferrous oxide buildup. Thanks for any ideas.
> B
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