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Unread 10-20-2021, 10:51 AM   #3
Texas Tile Contractor
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Join Date: Oct 2006
Location: Beaumont, Texas
Posts: 8,696
You might try putting that tile in a pan of water overnight. In many cases, if mastic was used, exposure to water will will re-emulsify and soften the material. If it remains hard...probably morter. If soft, probably mastic.
“Always listen to experts. They'll tell you what can't be done, and why. Then do it.”
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