Can PERMETHRIN AEROSOL be used to spray window screens to keep small nats from coming through?
You can try to see. I’m not sure the treatment would be strong enough to hold them back for any long period of time but it should help stop small insects from entering. You may also consider making your own formulation using the PERMETHRIN CONCENTRATE and a small PUMP SPRAYER. This would be much stronger and should last much longer too.