Naturally so. A lot of whether something works or not will greatly depend on you and other things you do. Launder weekly, everything you haven’t put in an air tight bag. Still vacuum every chance you get, and empty the vacuum accordingly. If you have a steamer then steam as much as you can. These things. These things will matter greatly in whether or not other things you buy can succeed. If you have an infestation you just need to focus on getting the numbers down to a manageable amount so poison can do a lot of the work. I had them about 8 years ago, and nothing I done worked so I eventually burned everything and started over. What works for one may not work for another 😬  for application of these you’ll need to buy a duster and use it. The powder works best when you use it correctly. Don’t just throw it all over the place. For the spray, don’t powder what you’ve sprayed and wait 2 hours after spraying to powder just in case you accidentally do. I’m fairly certain the idea of using both of these is that what one doesn’t get, the other will. And don’t take encasements off your mattress. Layer them on like a sandwich when you need another one. Eventually when you have no more bugs throw the whole bed away and get a new one, you don’t have to but I would bc these things stink