molds and casts |

by:Hanway     2019-08-17
The plaster of Paris is used to make various shapes and molds.At home, it is often used to make hand castings and other simple molds.Children like to use the plaster of Paris because it is fun and a bit messy and can be shaped in countless different shapes.However, the plaster in Paris may be heavy, so the right proportions must be used to make lightweight plaster that will not be heavy.
Heat the water between 75 degrees Fahrenheit and 100 degrees Fahrenheit.The lower the water temperature, the longer the plaster is mixed and solidified.The weight of the plaster has nothing to do with the temperature of the water you use, so just decide if you want the plaster to set fast or slow.In general, if you try to shape something with details, such as handprints, you will want the plaster to set up very quickly.
Determine the ratio of water to gypsum to be used.A 50-50 split will make the lightest plaster, while any mixture between 50 to 75 parts of water and 100 parts of plaster will make a stronger mold.Measure the proportion of gypsum and water using scale, or you can use measuring cups.Make a 50 because you are making lightweight plasterCracks between water and gypsum.
Pour water into a plastic or disposable container.Don't add plaster yet.Pour the plaster slowly into the water and stir when adding the plaster.This is the best way to prevent lumps in plaster.Before adding more plaster, make sure the water absorbs the powder poured at each point.Once you pour all the powder into the water, the mixture should be a little stiff and hard to stir.
Pour the mixture into the mold you plan to use.Gently shake the mold and release the bubbles that may be present in the plaster.If you are making a handprint or other body mold, spray your hand with a cooking spray before pressing the mold.This prevents sticky substances from sticking to your hands.
Put the mold aside and don't bother it within 24 hours.Do not let the child or pet touch the mold when the mold is dry.
Remove the plaster from the mold by pulling the edge of the mold container.The plaster should fall off immediately.If not, you can release the plaster from the mold with a butter knife.
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