sulfaric acid [Archive] - Ceramic Tile Advice Forums - John Bridge Ceramic Tile


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02-17-2010, 03:15 PM
how long should i wait to use acid to get micro stains from polyblend grout from matte tiles. vinegar helped some.

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John Bridge
02-17-2010, 03:23 PM
Hi Chris,

Don't use sulfuric. Get sulfamic at Home Depot or Lowes. You can use it now. Follow the directions. :)

02-17-2010, 03:27 PM
thanks john appreciate it. directions say wait 10 day , it's been 5. ok though? thank again. sorry for the spelling. chris

John Bridge
02-17-2010, 03:55 PM

Five days is long enough. Saturate the joints with water before you apply the acid solution. The beauty of sulfamic is that you can't over concentrate it. Excess crystals will simply go to the bottom of the bucket undissolved. :)

02-17-2010, 03:58 PM
awesome john! it seems to be working my hex tiles are beautiful again. tghank you so much john!!!!! chris

John Bridge
02-17-2010, 04:00 PM
I forgot the final step -- very important. Rinse thoroughly with clean water when you're finished. Don't leave any acid on the installation. :)

02-17-2010, 05:23 PM
okay thank you john.