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Community and Q&A

Bora-Care with Mold-Care

steve41 | Posted in General Questions on

I’m considering using Bora-Care with Mold-Care on my small addition, Zone 6A, Maine.  Primarily, it would be applied for peace-of-mind in the wall/ceiling cavities for secondary mold protection.  As in Matt Risinger’s video:

Is this product compatible with all of the various construction products that may receive overspray during application? Such as sill sealants, sill foam insulation, flashing tapes, vapor barriers, liquid flashing, existing wiring, etc.

I’ve reached out to the manufacturer with this question but have yet to receive feedback.  In the meantime I thought I would pose the question here and also perhaps gain other insight from those that have experience with this product.


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  1. Expert Member
    Michael Maines | | #1

    Steve, I don't have first-hand experience with that product but I know that it's mostly or entirely a borate compound and water, which should be pretty benign. Consider this a bump.

  2. steve41 | | #2

    Thanks Michael, and thanks for the bump. Agreed, it looks like there wouldn't be any compatibility issues with other products based on what I've learned so far. I'll likely do a quick spray test to confirm. My main concern would be longer term issues, that might not surface with a short duration test... such as when the spray gets into a sheathing crack from the interior and onto the adhesive side of Zip tape.

    I'll post my findings and also any feedback I receive from the manufacturer so that it can be searched by others if needed.

  3. nynick | | #3

    I mad my own for treating my recycled barn beams. Borax soap plus hot water to dissolve it. Totally benign and keeps the bugs out forever.

  4. steve41 | | #4

    Feedback from the manufacturer: "Bora-Care with Mold-Care is specifically for wood only. We recommend that if a large amount of the product gets onto any other material that it is cleaned off with warm water/soapy water."

    I'm guessing this is mostly a CYA response, which is fine and makes sense. I'll still plan to do my own testing.

    1. Expert Member
      Michael Maines | | #5

      Borates are close to pH neutral and there is nothing to offgas, which are two of the most common compatibility issues. I bet their CYA statement is largely because if left on an impervious surface, once dried it will leave a white residue.

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