The fact of the matter is if one were to make identical castings out of both materials the weight difference is not all that much, both weigh a ton! Plaster of Paris is best for patching holes in plaster walls, because its characteristics are more likely to match the wall material. Plaster is an ancient material that goes back at least to the Egyptians. It dries very hard in less than an hour. My 1st tried was with plaster of paris when i have a hard time looking for gypsum and hv no problem with that. So I am wondering for damp box usage would the plaster of Paris … I was growing grey oyster then. Pojman. 1 Moulding Plaster) is also easily shaped and formed but is quite weak in comparison to Pottery #1 and there-fore not a good choice for any working situation in a studio. Minor Worker Ant. 138. 20 … the difference being is that plaster of paris is much more brittle then Hydrocal. The term hemihydrate gypsum plaster is used to indicate plaster of paris with retarders mixed with it. For 150lbs of pottery plaster they want $75 in shipping! There are 4 different kinds of joint compound and all have different properties. Is it true that Hydrostone does not … Can also be used to mix your own DIY version of chalk finish paint. I am considering crafting my own formicarium. I have to order the pottery plaster online since I have no supplier near me. 138. Plaster of Paris (USG No. I understand plaster of paris is an additional process from gypsum, something about heating it further and i read in the net when you add water to plaster of paris it turn into gypsum. Smooth formula provides great results every time. You seldom need plaster of Paris to patch drywall. Sets fast in 20-30 minutes without shrinking. I need to make some new damp boxes. first you have lightweight quick set. Plaster mold casting is a metalworking casting process similar to sand casting except the molding material is plaster of Paris instead of sand.Like sand casting, plaster mold casting is an expendable mold process, however it can only be used with non-ferrous materials. And shinks. Post May 25, 2011 #1 2011-05-25T21:59. Interior use. I have a couple questions for the experts. This comes in powder form and has different setting times. What is plaster. Plaster of paris and patching plaster are the same thing. The plaster itself only costs $50. Hydrostone vs. regular plaster of paris Hydrostone vs. regular plaster of paris. Plaster of Paris is for general wall and ceiling repairs. On further heating to about 200C entire water content of crystallization is driven off and the resulting product is known as gypsum anhydrite or hard burnt plaster. The top two DIY chalkpaint recipes are put to the comparison test. 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