powdery cempolay MANCAVE surface - can it be saved?

Discussion in 'Subfloor Preparation' started by Ian Gorton, Jul 11, 2020.

  1. Ian Gorton

    Ian Gorton Member

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    after using BOSTIK cempolay (unfortunately not their "Ultra" or the "latex") self levelling compound:

    I applied 3 coats of Ronseal diamondhard garage floor paint. - It started peeling almost immediately. :(


    I've scraped up the easy bits (approx 1/4 of the floor) with the intention to use a sealer and repaint.

    should i use a dustproofer/hardener/sealer..
    even if I cannot repaint it, it needs to be sealed before laying a rubber floor right?


    any ideas/ product recommendations greatly received :)
     
  2. merit

    merit Well-Known Member

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    The concrete beneath the levelling compound needs to be dry and have a working dpm if your planning on installing a rubber floor.


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  3. merit

    merit Well-Known Member

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    Cempolay is not a great smoothing compound. If the subfloor is dry you could remove the old paint and try using a primer before painting again


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  4. Ian Gorton

    Ian Gorton Member

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    Apparently the subfloor does get wet along one edge. Rain flows down the drive and hits the garage wall,.. so it's not creeping up from below.
     
  5. dazlight

    dazlight Super Moderator

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    How old is the garage floor? Does it have a visqueen Dpm sheet under the concrete ?
     
  6. Ian Gorton

    Ian Gorton Member

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    No idea how old (nothing on the planning portal), There is only damp around one side wall - a recently blocked up garage door, leading me to believe that there is a DPM underneath but no DPC on the new wall.

    Thank you all for your patience and help, I am at a loss for what to do atm,.
     
  7. Ian Gorton

    Ian Gorton Member

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    Apparantely the "Bostik Cempolay Ultra Strong " self levelling compound is water resistant and overpaintable.
    Maybe a layer of it on top of my semi-painted, powdery layer? bit of an expensive solution though.
     
  8. dazlight

    dazlight Super Moderator

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    Did you mix it with water
     
  9. dazlight

    dazlight Super Moderator

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    You should be able to see it around the wall if no skirts are on.
     
  10. Ian Gorton

    Ian Gorton Member

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    no sign of a DPM.
    lol.
    I could try sprinkling on extra water to the powdery parts,. perhaps there are areas where we had inconsistent mixes.

    unless anyone has any better ideas:
    I've decided to pour the ultra strong version tomorrow , once i'm happy all the flaky paint is up and i've wetted and primed the floor.
     

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