Knockdown ceiling flaking off

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q knockdown ceiling flaking off
Knockdown plaster won’t adhere to ceiling in florida room. Flat roof. There’s no leak.Flaking occurs within a week or so in some areas. Have re-done affected patches several times & it recurs. Want to make ceiling plaster smooth (no more Knockdow). How do I do this?
q knockdown ceiling flaking off
  9 answers
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