The only place the mud daubers like to leave nests on my house is over the front entry on the ceiling. I have heard that painting the ceiling sky blue will keep the daubers from nesting there. Is this an effective technique or just a useless idea?
We have not seen any color prevent or deter this pest from making their nests. But you do have two good options that can help.
Your first is to apply some CYPERMETHRIN by either spraying or painting it onto your ceiling. Wasps hate this stuff and will avoid treated surfaces. Treatments should last a month or more.
Your second option is to paint it blue and add some NBS PAINT ADDITIVE. This product is highly repellent to many insects including wasps. If you add some NBS to blue paint, they’ll stay away for sure and treatments this way can last a year or more.
Your last option is to mix the NBS with water and spray or paint it onto the ceiling. Treatments this way will last a month or so.
Here are direct links to the products mentioned above: