caulking internal MDF

Discussion in 'Builders' Talk' started by skiing phil, Aug 16, 2019.

  1. skiing phil

    skiing phil New Member

    hi all, newbie here...

    I’ve used MDF internal to build some cupboards in a insulated loft space. I need to caulk some edges and have read that I should use siliconised acrylic latex sealant.

    I’m struggling to find a sealant that states all of the above in its description so I must be missing something. Any advice on which siliconised acrylic latex sealant to use is welcomed.

    Thanks in advance
  2. WillyEckerslike

    WillyEckerslike Well-Known Member

    Welcome Phil. Not heard of that before. If you're talking about gap filling between edges and walls prior to painting I would avoid anything with silicone in as the paint probably won't stick. A decorators caulk or acrylic sealant would be my choice.
    If you're selling the fluffy MDF edges there are a number of options. MDF primer, water based primer, shellac, Zinsser BIN etc. Be prepared to apply, allow to dry, sand, apply more, allow to dry, sand, apply more etc dependent on the quality of the finish you want. You can achieve a really good edge on MDF if you're committed.
    Alternatively you could use an iron on edging.
    Good luck.
    Astramax likes this.
  3. Astramax

    Astramax Well-Known Member

    Use Geocel paintable frame sealant .

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