My understanding is it drys super rock hard and would be a lot harder to shape and carve after it is dry much like DuraBond is. It's application is a finishing plaster that's mostly used in commercial buildings where a more durable finish for abusive areas such as stairways. I use a lot of them but I must admit I have not used diamond but know what it is for. USG make Superior plaster products that I have been using in construction most of my lifetime. Hydrocal gives you a little more working time and a lot more ultimate strength, but they should all work perfectly well to soak up the gauze.Īll things considered, I'd go with the PP. But I've used all the above for rock casting, and as I prepared the solutions, I never noticed any significantly different handling characteristics. I don't know about using either hydrocal or lightweight hydrocal or hydrocal 20 or hydrocal 30 or Ultracal or plaster of Paris with gauze cloth. Finished plaster is a lot easier to carve and sculpt using gouges and chisels.
Hydrocal 30 is literally three or four times as strong and a lot harder than plaster of Paris. Plaster of Paris costs a little less and is available at all the big box stores and craft shops. If you live nearby, great if you don't live nearby, not great, but still not too horribly bad. A 50-pound bag of Ultracal 30 is about $30, but it costs about $30 to ship it. Sheffield Pottery in Sheffield, MA ships three or four grades of genuine hydrocal and ultracal, and other casting materials as well.
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