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[quote]QUOTE: hydrocal is ok but if you use plain plaster of paris it will work also..it is also a lot stronger and cheaper than hydrocal ..[/quote] This has not been true in my experience. Hydrocal sets up very hard, much harder than Plaster of Paris. It is not carvable after it sets up. It sets up so hard (avoid the obvious bad joke here) that I had to use a sawzall to cut out my mountains when taking down my layout. The sawzall dulled out and we switched to hammers, Big hammers. The reason Hydrocal is recommended for layouts is because of its superior strength. Hydrocal's hardness can be a drawback if you want to come back in later and carve stuff to blend it with other scenery. Most of my train friends have switched to casting plaster because it is easier to carve. I have carved many square feet of Hydrocal (as it sets) and I like the strength it develops. Guy
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