Mastic removal - Polisher with Diamabrush or 7" Grinder

Discussion in 'Remodel Forum & Blog' started by Soparklion, Jan 13, 2019.

  1. Soparklion

    Soparklion New Member

    Joined:
    Jul 14, 2016
    Location:
    Pennsylvania
    I need to remove paint/mastic from ~250 sq ft of concrete. I'm considering a $50 DeWalt diamond wheel on a 7" grinder vs renting a floor polisher and a Diamabrush for ~$140/day. The polisher has a hookup for a vacuum that would hopefully diminish dust...
     
  2. cacher_chick

    cacher_chick Test, Don't Guess!

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    Land of Cheese
    The diamond wheel might gum up pretty quickly. I did a floor where I scraped off as much as I could with the scraper and then finished cleaning it with adhesive remover.
    I think the diamabrush should save enough time the the cost would be worth it, but I have no personal experience with it
     
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  4. Soparklion

    Soparklion New Member

    Joined:
    Jul 14, 2016
    Location:
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    Thanks. Is there an adhesive remover that you would recommend?
     
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Retired Systems engineer for defense industry.
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    Many mastics soften when wetted. Is the area someplace where you could get it all wet and let it sit for a bit? If so, it will likely come up fairly easily with a scraper. A steamer might work pretty well, too. You can get scraper blades that fit on a pole. Buy a box of the blades, as they get dull fairly quickly over a concrete surface.

    If you're planning to tile the area afterwards, do NOT use a chemical stripper. In fact, the mastic may have seeped into the pores of the cement, and the only way to get a reliable thinset bond would be to run a scarcifier over it to remove a thin layer. That will also rough it up a bit, also improving the thinset bond.

    The way to tell if thinset will bond to the surface is to spread some water on it. If it beads up, thinset won't bond well. If it gets absorbed in less than about 15-minutes, you should be okay.
     
  6. cacher_chick

    cacher_chick Test, Don't Guess!

    Joined:
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    Test, Don't Guess!
    Location:
    Land of Cheese
    I bought a gallon of Zinsser adhesive remover, which is what they had at the local hardware store. I really dont have anything to compare it to.
     
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