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  1. #1
    Join Date
    Mar 2012
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    13

    Default Thin hairline cracks in Plaster Paris - how to fix?

    I am just learning how to be a handy-person. I have patched the nail holes in the plaster using some CGC compound, sanding and then reapplying (for far 5 times). I know it is overkill, but again I am just learning.
    I have noticed some hairline cracks in both the ceiling and the walls. How should I go about fixing this? Do I need to buy that mesh stuff? Any help is appreciated.

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,081

    Default Re: Thin hairline cracks in Plaster Paris - how to fix?

    Hairline cracks can be fixed without that "mesh stuff".

    You will need to enlarge the cracks just a little bit, using a utility knife, so that the plaster of paris mix that you will prepare for that will go in the wider cracks. You can apply the mix with a brush or with your fingers (it's a lot of fun, but wear thin gloves). Let dry, then sand lightly. IMHO, some very thin and barely visible cracks are not worth messing with.

  3. #3
    Join Date
    Mar 2012
    Posts
    13

    Default Re: Thin hairline cracks in Plaster Paris - how to fix?

    thank you so much for the reply!
    I have the pre-mixed Plaster paris, so I hope that is ok. And I bought the TAPE rather than the mesh - the store associate talked me into it, so I also hope that isn't a problem.

    UPDATE:
    Well I tried the tape - and not being a professional, it shows way too much. I stripped the tape off and I am just going to use filler in the cracks for now until I know more.
    Last edited by netrate; 03-15-2012 at 12:17 PM.

  4. #4
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Re: Thin hairline cracks in Plaster Paris - how to fix?

    The problems that accrue to using patching plaster by far outweigh the very slight speed advantage/ 1) no chemical bond to the underlying lime plaster browncoat, or the lime & gauging whitecoat. It will hold only by a mechanical bond.
    2) No tensile strength.

    So I recommend either patching with lime & gauging, over mesh tape (for tensile strength), and prime the cracks with a bonding agent (Link or Plasterweld); Or use setting-type mud (Durabond 90) and again, spray, roll or sponge a bonding agent into the cracks to seal and prep the repair so you get a decent shot at a strong bond. Once you gat a coat of Durabond on the repair, you can finis skimming with regular green-lid drywall mud, or trowel on some Easysand 45 (like Durabond only a bit more sandable) to feather it out. In a wet area, (bathrooms) stick with Lime & Gauging or Durabond, they are more forgiving of moisture.
    Casey
    Remove not the ancient landmark, which your fathers have set.

  5. #5
    Join Date
    Jun 2009
    Posts
    254

    Default Re: Thin hairline cracks in Plaster Paris - how to fix?

    I would agree with Sombreuil to use a Lime / Gauging mix.
    Plaster of Paris would set very fast and be to hard also could set with very little bond to the existing plaster.
    A good mixture would be about 7 parts Lime & 1 part guaging.
    And if you want it to set faster add about 1/2 part Moulding Plaster ( Plaster of Paris ),

  6. #6
    Join Date
    Mar 2012
    Posts
    13

    Default Re: Thin hairline cracks in Plaster Paris - how to fix?

    Thank you for the reply. Again, being new at this, I am sure that I am making more mistake than are necessary.
    I didn't read this until today and I had already patched the cracks using CGC compound. I know that this is not Link or Plasterweld, so at least it is only one room that I will have the issue in the future. A question though, will the plaster shift from the seasons? Since I patched it, it is good for a while, or will the cracks just show again in the future and I will have to use the Plasterweld or Link?
    Would this work:
    http://www.canadiantire.ca/AST/brows....jsp?locale=en
    Last edited by netrate; 03-18-2012 at 05:01 PM.

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