You can probably special order it from Lowes or home depot if they don't have it, but this isn't a basic do-it-yourself project. The plaster dries to a very hard surface which makes it really difficult to sand. In fact, it isn't intended to be sanded. The professionals that install this stuff put it on so well that it doesn't need sanding. After the plaster has set, but before it is completely dry, they mist some water onto the plaster and trowel it to a smooth, hard, flawless finish...similiar to the way a concrete floor is finished. If you aren't experienced in this, you may end up with a mess. The plaster is much harder to use than drywall mud (joint compound)since drywall mud can be easily sanded. I've done quite a bit of drywall, and I'd leave it to the pros. Good Luck.