How to prevent mold under shower sealant in Dubai?« Back to Previous Page

My bathroom in my Mirdif villa has had this musty smell for weeks, especially in the corner where the shower is. I just pulled back the silicone sealant and found a ton of black mold growing underneath it. We keep the exhaust fan on during showers, but the humidity just doesn't seem to go away completely. What's the best way to re-seal the shower to prevent this from happening again, and should I use a specific type of anti-mold silicone that's available here?
Posted by Sara Russo
Asked on April 19, 2026 9:20 am
Bathroom mold under silicone sealant is a common issue in Dubai due to the high ambient humidity and condensation from air conditioning. The key to a lasting repair is addressing the moisture source, not just the visible mold.

First, the existing mold-infested sealant must be completely removed. Any remaining mold will regrow. After removal, thoroughly clean and dry the joint using a dedicated mold remover, then treat the area with an isopropyl alcohol solution to kill any residual spores and ensure a perfectly clean, dry surface for the new sealant.

For the reseal, use a high-quality, 100% silicone sealant specifically labeled as "mildew resistant" or "anti-mold." These contain biocides that inhibit regrowth. Brands like Soudal or GE are widely available at ACE Hardware or hardware stores in Dragon Mart. Avoid acrylic or siliconized acrylic sealants, as they are porous and will fail quickly.

Allow the new sealant to cure fully according to the manufacturer's instructions before exposing it to water. To manage the humidity that caused the issue, run your exhaust fan for at least 30 minutes after showering. Consider installing a timer switch for the fan to ensure it runs long enough. Wiping down shower walls and the sealed area with a squeegee after use is highly effective at removing standing moisture.

For persistent, recurring mold problems or if the mold has spread behind tiles, a professional inspection can identify hidden moisture or ventilation issues that DIY solutions can't address.
Posted by Sani Admin
Answered on April 21, 2026 7:36 pm