Skills and techniques that are useful for the casting of Plaster of Paris (PoP)

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Many people choose the Plaster of Paris castings over the other casting materials because they are advantageous in many possible ways. Some of the reasons why the Plaster of Paris is advantageous over the others are the following:

The major reason is that they are available at a lower price than any other casting material. 

It is very easy to use. All that you have to do is to take the required amount of Plaster of Paris and mix with the required amount of water and pour them in the molds to get the desired shape.

Plaster of Paris is a more environmental-friendly casting material than the resins which is a great deal.

Things required to begin with casting of Plaster of Paris

You can start using the Plaster of Paris by getting a kit or buying the following items individually which are easily available.

  • Plaster of Paris (from a good manufacturer)
  • Mold for getting the required shape
  • Bubble Buster
  • A mold release (just use vegetable oil)

Adding a plaster additive to the plaster will make the plaster to work better. Thus, considering the amount of Plaster of Paris that you are using, add 3% of the plaster additive for improved results.

Instructions for Plaster of Paris castings

  • Three parts of Plaster of Paris mixed with one part of the water is the ideal ratio for using Plaster of Paris for casting. Measure the water for the amount of Plaster of Paris that you have taken and pour it into the container. If the paste is thicker, then you can add some more water to make it smooth. But make sure that you don’t pour much water as it weakens the plaster. Keep in mind the 3:1 ratio and start working along with that. 
  • Remove the clumps of plaster if any with a spoon. Wear a glove if you want to use your hands.
  • While mixing the water and plaster, you must mix the powder into the water. Spread the plaster powder evenly on the surface of the water to avoid bubble formation. After the addition of PoP, you will be able to see them slightly above the water surface.
  • Gently stir the PoP mix until it becomes into a thick pancake consistency. It will also reduce the chance of bubble formation greatly.
  • Once after getting the PoP mixture in the required consistency, pour them into the molds. There are many online tutorials available over the internet which will help you in this case.

Final thoughts: 

Never pour the extra plaster down your drain because there is a high possibility for them to harden and destroy your plumbing. If there is excess plaster, either dilute them and use it for future purposes or throw them away. 

If you wish to add colors to your plaster, add colorants to the plaster mix when it is in liquid/paste form. You will need to add more colors to make them look darker because the natural color of the Plaster of Paris is white. All types of paint will work well with the Plaster of Paris.