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Spread with Plaster with a Trowel

Spread American Clay plaster at low angle with trowel.
Copyright Lee Wallender - Licensed to About.com
Now, here's the fun part. With a trowel, you spread the plaster very thinly across the surface at a low angle. What this means is that you're not laying it down in thick, drywall compound-like sheets, but even thinner. The good thing about this is that it extends the product, so that a 50 lb. bag with the correct mixture of water is extimated to last an average of 160-180 square feet.