The application of diatomaceous earth over a large area in your home can be performed best with applicators like the Wilcox 3 Quart duster. But if you are working on covering a tight space in DE you may want to invest in one of these: Our Gilmour Duster. This duster is designed for easily applying DE in hard to reach places, like under your porch, alongside molding, or behind the stove.
To Use the Gilmour Duster:
Open up the duster and fill it with DE.
Hold the nozzle 6" to 12" from the area in question and pump.
Reapply monthly or after heavy rainfall depending on the DE's purpose.