Yes, you can use a mist blower, such as a Stihl or Solo 451, when applying Cy-Kick CS. Be sure not to leave product inside of the applicatior after application.
Cy-Kick CS is a great product and will do a great job towards helping you to get rid of roaches. For best results, we also recommend that you use a roach bait gel to help get rid of roaches in places where you cannot spray, along with an insect growth regulator (IGR) which helps stop the roaches breeding cycle. You may want to consider using one of our New York Roach Control Kits, as they contain all of these products together. Pets and people need to be kept out of the area while products are being applied, but can return as soon as all surfaces are fully dry. Please take a moment to look over our article on How to Get Rid of & Kill Roaches for more information on how to do a complete treatment for roaches.
When using an Actisol Compact Portable Aerosol Unit, we would not recommend that you use any wettable powders or a microencapsulated product. Cy-kick is a microencapsulated product so we would not recommend using it in your Actisol unit.
Cy-Kick CS is not labeled for use on gnats and would not be effective. As an alternative you could use Tempo SC Ultra.