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Old 01-15-2012, 10:08 AM   #1
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Cutback Removed -- Now What??


I received some (apparently) bad advice and spent a lot of hard time and messy effort removing a thin layer of cutback using paint thinner from a concrete slab. Should have researched this better first. It left what looks like a stain on the slab, now I hear that chemical residue may be a problem.

Should have researched this better first. Anyone have an opinion on how to proceed? Soap and water? Drysweep? Just lay right over it (we are using a modified thinset)? Any other good ideas?

I'd appreciate any advise.
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Old 01-15-2012, 10:15 AM   #2
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Cutback Removed -- Now What??


Sorry, tried to edit and somehow this posted twice. If moderator wishes to remove redundant one, please feel free.
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Old 01-15-2012, 10:27 AM   #3
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Cutback Removed -- Now What??


How long ago did you use the thinner?

I suggest you use a two part thin set for this---that is the best bet as you have a possible bond breaker going there--

Unmodified mixed with liquid latex or acrylic---Kerabond and Keralastic is a good example--
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Old 01-15-2012, 10:46 AM   #4
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Cutback Removed -- Now What??


2 days.
I have ultraflex 2 (MAPEI) on site (supposedly, this is professional grade as opposed to ultraflex 1). When you say "use a two part thin set for this," do you mean making my own modified by buying unmodified and adding an additive and then proceeding normally, or are you suggesting a 2 step application? Or increasing the ratio of additive to 2 parts? (sorry if this is a dumb question, I assume its the first option, but want to make sure, thanks).
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Old 01-16-2012, 04:44 AM   #5
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Cutback Removed -- Now What??


Ultra flex is a good modified--But I always used unmodified and a liquid--that has never failed me--

I think you have waited long enough--
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Old 01-16-2012, 06:52 AM   #6
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Cutback Removed -- Now What??


Thanks for the advice. We won't be getting back to the project until next weekend, so it'll have some more time to sit.
Thanks again.
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