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My basement floor years ago had a tiled floor. Tiles were adhered with what looked like a black tar type adhesive. Tiles came loose and were removed. Even though the floor is smooth I am unable to get all the substance off the floor. Can this stuff be painted over or do I have to retire the floor. Prefer to paint if possible.

  • intuitively, if you can't remove it, neither would moderate traffic... – dandavis Jan 14 '18 at 21:23
  • A lot of that "mastic" has asbestos in it, so sanding or grinding will only make it airborne. – Sport Jan 17 '18 at 16:05
  • Good point on making sure it doesn't have asbestos before grinding it away. – eaglei22 Jan 17 '18 at 19:00
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Rent a concrete floor grinder from a local tool rental. It should get rid of the majority of the adhesive and any other surface coatings. Then, you should be able to go through the normal process of proper concrete painting (make sure to read up on proper surface preparation for your selected product to ensure best adhesion and results).

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