Large pump bottle is great for Cornstarch for your cookies before you heat seal them
 
put your dusts, lusters, & rolkem colors in. Much easier to control the amount that is dispensed.

Spray one pump at a time on a piece of parchment then use a brush to highlight without all the wastes and spills of a traditional container of luster and power.

I also just spray dust over project for a random dusting. Love this for my golds and silvers to finish off my fall leaves!