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Hello mbshaw, If you're building hardshell scenery, use hydrocal. Drywall mud doesn't have any where near the strength hydrocal does. I've taped and mudded sheetrock, and the pre-mixed mud is too thick to dip a paper towel into. Thinning it with water would only weaken the mud further. The scenery base will be more susceptible to damage, and may even collapse. If you're looking for something to layer over carved extruded foam board scenery to add texture, drywall mud would be an acceptable alternative. However, I prefer Sculptamold for this step or even plaster of Paris. Both are tougher than drywall mud and are lightweight, too. Regards, Paul Schmidt Contributing Editor Trains.com
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