Not Jim but answering, as I literally just ordered some to give it a try. Thats the stuff I think, the water stain remover, if you look at the label in the amazon picture it says "clean and green" on it. They also make a sealant, not sure if anybody has tried that.
I tried using some gloss tile sealant not too long ago, that worked pretty well for signs that are clean but have lost some of their outer glaze. It seemed to soak in on the porous areas, did nothing to the other areas. Overall, it evened out the sign, improved the color a little, nothing dramatic, just kind of evened out the sign from the good to bad areas shinewise. Sorry dont have any pics, probably wouldnt see it anyway.
Last edited by Paul Bell; Sun Apr 26 2015 09:32 PM.