Mark from Fremont Ca writes
I have an old bottle (about 20 years old) Is it still safe to spray for spiders on the exterior of my house
Sevin Concenrate has a shelf life of 3-5 years so therefore the bottle you have would not be effective. We would not recommend using Sevin Concentrate for the treatment of spiders as there are better products for spiders. Suspend SC is a great general purpose insecticide for outside perimeter treatments.
Answer last updated on: 10/13/2015