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Old 02-21-2010, 08:02 AM   #1
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any one know, can you mix modified with un-modified thinset. I have a 50lb. bag of un-modified that i,m using to apply Kerdi with in my new corner shower before i tile it and was planning on using it on the floor for the tile there, but I;m guessing i wont have quite enough to do the whole bathroom floor. i have partly used bag of modified thin-set as well (about 20lb,s) and i thought i might just mix a bit in with every batch of un-modified i mix when i get to the floor. And I;m tiling on a bed of self leveling concrete I poured to flatten things out. also planning on applying a bonding agent to it before i lay down the thin-set. Any advice?

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Old 02-21-2010, 09:26 AM   #2
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I wouldn't, thinset is cheap, go pick up a fresh bag of what you need.

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Old 02-21-2010, 02:52 PM   #3
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I think it would be OK to blend the two thin sets. But once open, thin set has a short life span, so unless it's new don't use it.

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Old 02-21-2010, 06:14 PM   #4
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Quote:
Originally Posted by JazMan View Post
I think it would be OK to blend the two thin sets. But once open, thin set has a short life span, so unless it's new don't use it.

Jaz
both bags are new, a few days open. using them this week. used a bit of mixed to fill a little gap in the back corner of my corner shower where my cut of the durock went a bit askew (oops!!) to make smooth corner for the kerdi band.seems to be okay. i am using the non-modified thinset for applying the kerdi over the durock and to adhere the tile to the kerdi. just thought if i was a little short when i got to the tiling of the floor i could mix in a bit of the modified to make up the shortage. i know they have slightly different curing times but wouldnt be going near the floor once tiled for a good 24hrs to make sure everything was hard. another thought. as a opposed to mixing, what about using both on the same surface, if i was to run out of one could I switch to the other on the same floor? what would the difference be once i've grouted, once set up there both basically the same thing, hardened thinset.
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Old 02-21-2010, 07:58 PM   #5
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Quote:
Originally Posted by JazMan View Post
I think it would be OK to blend the two thin sets. But once open, thin set has a short life span, so unless it's new don't use it.

Jaz
Wow - glad I read this!
I was planning on using up thinset that I opened 3 years ago.

OP - yes, it's pretty cheap - I wouldn't try to mix them together and bet time and tiles on it . . . just buy a new bag.
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