Stevie from Alabama writes
Demon Wp is one of the strongest products still left on the market. That being said it will not kill immediately once dry after a spider walks over it. Spiders are especially hard to kill because their main bodies are up off of the ground and they do not groom their legs like other insects. There is no product that will kill very quickly, within minutes, after it is dry. Only contact kill products, aerosols mainly that are sprayed directly on a spider, like Raid, will kill it that fast. Demon is still considered the best residual product for spiders.
Answer last updated on: 06/22/2012