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Absolutely! Our N-scale club uses it exclusively for building up terrain. Of course, we start out with the rigid extruded foam to get the general shape, then fill it out with the joint compound. It comes in handy if you've got a slightly raised roadbed alongside of some lower roadbed by putting it on, then drawing your putty knife at an angle to simulate an embankment. <br /> <br />If you use it for filling, don't overwork it. You can take wire screening material to "sand" it down a bit, but I usually just leave the whorls and swirls in it. They get covered by the ground cover, and on hillsides, add a bit of form to what could just be a dull rounded hill. <br /> <br />We buy the 5-gallon buckets of joint compound as cheap as we can find. It goes a long way toward getting your scenery built up. It doesn't react with the foam, and it's cheaper than buying plaster of paris or hydrocal.
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