Steven from Alabama, Usa writes
Talstar P and Demon WP are both synthetic pyrethroid products and work in a very similar way. The key difference here would be that the Demon WP is a wettable powder and as such it is able to stay on the surface of porous areas allowing insects to come in contact with it a bit better. That being said Demon WP also leaves behind a white powdery residue that is visible on dark surfaces. Talstar P is a concentrated liquid that is odorless, dries clear and is labeled for a huge variety of insects (including roaches) and areas making it a bit more versatile.
Answer last updated on: 06/27/2012