The Puffer R Duster is the "Professional's Choice" when it comes to crack and crevice treatments of fine dust products into small areas. This product has a 6-inch extension to treat hard to reach places.To use the duster, fill the tan rubber container (bellows) half-way full with an insecticide dust product such as Drione Dust or Delta Dust. It is recommended to place a small rock in the duster to help break up the dust and prevent it from clumping. Compressing the bellows will cause dust to escape the metal tip of the duster. Using a duster allows you to inject dust more easily into cracks and crevices or inside wall voids where insects like to hide. We highly recommend purchasing a duster when applying any dust products. Note: This hand duster does not come with an insecticide dust. You will have to purchase the dust separately. How do I properly use the hand duster? Remove black rubber cap from top of duster. The duster should be filled only halfway - no more than two-thirds full. This allows for adequate air space to create the desired air/dust mixture prior to application. If there is too much dust in the duster, clumps of dust on treated surfaces may result, leading to over application of the product and messy spills. Between each squeeze, the duster should be shaken slightly to get dust floating inside the duster. When applying dust into cracks and crevices and on surfaces, gently squeeze the duster to ensure the application of very thin layers of dust. When dusting correctly, you should barely be able to see the dust emerging from the tip of the duster. Before relaxing your grip on the duster, pull it away from the surface or crack you are treating to prevent sucking up lint, moisture or debris. Small amounts of these items will eventually cause lumping and/or clogging of the duster. In the event that the nozzle becomes clogged, you may unscrew the rod from the rear of the nozzle and insert it into the nozzle to break up any clogs.