Whatcha know bout dis? Tile Question

WillS

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See text message below from customer.

The tile installer will not call them back anymore. Rough residue on the tile. She is saying it is grout residue but I am not sure. I asked for pictures, she didn't have any. Asked me to stop by the empty house and look at it when we had time. Any ideas on what this maybe or suggestions I can give to her? Or something we can do?



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Old Coastie

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Will, removing cementatious grout is easy, but do NOT use muriatic acid.

Go get Viper Renew from your Interlink supplier, or a non-fuming concrete brightener/etcher from your local chemical pimp. Dab it on the tile with a sponge, let it fizz and soften and periodically poke it with a plastic scraper to help break it up.

Ventilate well

Use a wet vac or your hard surface wand to suck it up, repeat as needed. At the end, slosh something alkaline to neutralize things, rinse and there you are.

You can get rid of some real crusty slops that way. However if he used an epoxy grout, you need to use acetone, and good ventilation.

How to tell the diff? Drop acid and if it foams it is cement.
 
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WillS

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What do you mean by dab it? Can you spray it with a pump sprayer and let it sit? Doing it by hand with a sponge could be a lot of work with 600 - 800 sq. ft.
 

Old Coastie

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The key is that you don't want to uneccesarily damage the grout lines. So yes, a pump sprayer held low over each tile would work.

Do a section at a time. Wear an acid fume respirator if you love your lungs. Charge handsomely, at least a dollar a foot. It will take you all day.
 
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WillS

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.... and you can't use a 175 w a white pad or something sponge like soft to peel it off?
 
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JS41035

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Great advice. I did a job very similar for my cousin and his wife. Used the viper acid stuff. I agree with all of the above. Don't use a 175. Will make a mess. A small stiff brush is ok. Do small areas.
 
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Old Coastie

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Will, the lowball will go in with a metal scraper and muriatic acid.

When he is done, there will be an acid residue on everything, from fumes condensing. The chrome and stainless fixtures will be damaged; rust dots on stainless, a sort of gun blueing on the chrome. The grout lines will be visibly cheesed out and they may need to be refilled.

I wish you got the bid, but file all this away for the next time. BTW, your price was a very generous one.
 
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