I got some bad advice about grouting slate tile and now it is really cloudy. I tried 409 and that made it worse. Would muratic acid do the trick?
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I would try the muriatic acid. Not full strenght, mind you. pour a couple gallons of water to the bucket, then add about 10% of that volume of muriatic acid. wear gloves, and have lots of ventilation, cause the stuff does not smell nice. scrub with a stiff nylon brush, dipping in the acid solution often. The grout between the tiles should fizz just a little bit. If it's not fizzing, it's probably not doing much for you.
10% is a place to start, gradually add more if that doesn't work. I wouldn't go any stronger than 1:2 HCL to H20. Acid wash is only effective on concrete for a limited time, if it's too far cured, this won't work very well.
zak
"so it goes"
Thanks! I grouted the tile 3 days ago. Do you think there is still a window of opportunity?
yes, work away, I've used scotch bright pads also. if these have a glaze finish be careful using pads.
Next time seal tile before grouting
Edited 6/3/2006 8:42 pm ET by Danusan11
thanks for the advice.
dave
I'd say there's hope for you. Get going on it ASAP though.
With some stones/tiles a wire brush will work, but often it will leave marks of it's own. I would try it as a last resort, in a hard to see area.zak
"so it goes"