Bubbled paint in bathroom?

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We primed our bathroom with Kilz and painted over the wall with semi gloss paint. As soon as one of us took a hot shower the new paint job bubbled. What is happening? Half the wall is regular drywall and the lower half of the wall is concrete drywall. Should we have use oil base paint? How can I fix the problem with out replacing the drywall?

One Response

  1. The issue of paint bubbling in a bathroom after a shower can be attributed to moisture exposure, which may not have been adequately addressed during the painting process. The use of semi-gloss paint, especially over a surface that is prone to moisture like a bathroom, can exacerbate this problem due to its low permeability to water vapor.

    In your case, the combination of a bathroom setting and the different materials (regular drywall and concrete drywall) in the wall can further complicate the situation. Concrete drywall is more resistant to moisture than regular drywall, but both materials can still be affected by high humidity levels, leading to paint bubbling.

    Using oil-based paint is not necessarily the solution, as it may not address the root cause of the moisture issue. Instead, consider taking the following steps to fix the problem without replacing the drywall:

    1. **Identify and Fix the Source of Moisture**: Ensure that your bathroom is properly ventilated to reduce humidity levels. Consider installing or using ventilation fans to expel moist air from the bathroom during and after showers.

    2. **Allow Sufficient Drying Time**: Before repainting, make sure the walls are completely dry. If moisture is still present, it can lead to further paint bubbling. Use a dehumidifier or fans to expedite the drying process.

    3. **Use Moisture-Resistant Paint**: Opt for a high-quality, moisture-resistant paint specifically designed for humid environments like bathrooms. These paints have better protection against moisture and are less likely to bubble or peel.

    4. **Apply a Primer Sealer**: Consider applying a separate primer sealer specifically designed to block moisture and create a barrier between the wall surface and the paint. This can help prevent the paint from bubbling due to water vapor.

    5. **Reapply Paint Properly**: Once the moisture issue is resolved, repaint the walls using the correct paint type and application techniques. Make sure to follow the manufacturer’s instructions for surface preparation, application, and drying times.

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