![]() ![]() I would leave it on over night because you cannot over dry a mold provided you stay below the magic temperature. With my box, with 2 x 100w bulbs and a computer fan to keep the air moving, I could dry a mold in 6 - 8 hours. Other ideas are, radiators, airing cupboards, the back of a refrigerator is a good one. In a normal living room, you are looking at a week. The water loss is not likely to be constant, so I would aim for 27% and call it a day. You could apply this method to oven drying to get an idea how much water is left. This means that you can weigh the mold after a few hours (air drying or I use a light bulb box heater), you can actually predict when the mold will be dry. I also discovered that the rate of weight loss was constant. It is often used to create and hold decorative plasterwork on ceilings and cornices. I weighed the freshly made mold and weighed the fully cured mold. When dry, the plaster of Paris does not shrink or fracture, making it an excellent material for casting molds. I did some experimenting, the results might be of use to you: Once the water is gone, the mold temp rises with the oven and unless you rescue the mold very soon, it will be ruined. When oven drying, as long as there is water still in the mold, it cannot hit that magic temperature, held back to boiling point until all the water has been driven off. ![]() The problem with plaster is that there is a temperature beyond which a chemical reaction takes place and the mold turns back to the original stuff before you added water in the first place. ![]()
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