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I am working on filling the gaps and initial terraforming my all-foam layout. I have had some mixed results with Great Stuff - it is good for filling big gaps on the sub-beds and giving enhanced structural stability. It is not good for filling into the WS foam risers - the Great Stuff will slowly expand with enough force to lift roadbed and track off and uneven. I had to remove my roadbed and track and cut-off the excess Great Stuff. DAP ltw spackle appears to be a foam-type spackle. Weighs very little compared to the regular spackle/mud and very easy to apply. I am very happy with it so far and it supposedly will not shrink or crack. An alternative to Sculptamold and paper mache.
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