When I make a teapot cake (see in my pics), I roll gumpaste out very thinly. Then I dust the spout of an actual teapot with CS. I lay the gumpaste sheet over the real spout, and form it to shape, so that the seam is underneath. About 1/4" at the pot end forms onto the body of the pot itself (this 1/4" ends up being the surface you can use to glue it to the fondant covering the pot itself.)
Before it dries, I trim any excess around the lip to neaten it up. Then I let it set, still on the real spout for an hour. It turns out hard, the perfect shape, and light as a feather. I just glue it to the fondant covered pot, no skewers needed. And it doesn't look all thick and doughy. It looks delicate, like a real pot would, like you could really pour from it.
This post is filled with tips on the Teapot cake... HTH
http://cakecentral.com/cake-decorating-ftopict-654666-teapot.html
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