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How to Pour Plaster of Paris Crafts Moulds

Enjoy crafting fun with this super popular plaster of paris crafts idea. Kids and adults will love adding their personal style by painting designs on plaster crafts moulds.

For over 20 years, my husband and I worked at a year round camp and retreat center. When given a choice of all the amazing activities available, crafts was hands down the most popular!

It was my job for some time to choose the Summer camp crafts options, and there was one craft that NEVER went out of style – painting plaster craft moulds.

tea pot

It is an inexpensive craft to provide, and went through hundreds of plaster moulds a year.

Once a year, we spent a few weeks pouring hundreds of plaster of paris moulds so that they’d be available for campers to paint during craft time.

This post will walk you through the process of how to pour your own plaster designs using moulds.

What type of plaster of paris should you use for plaster crafts using moulds?

DSC_6184

Because we were pouring such a large amount of plaster craft moulds, we purchased these “No 1 Pottery Plaster” bags.  You can find it here in a 50 pound bag. You may want to check your local building supply stores. They just might happen to have it, too.

**WARNING!!:  This is a messy job!  Prepare yourself and the location  accordingly.  Wear an apron to protect your clothes, rubber gloves to protect your skin (if only I could find some with short enough fingers for my hands…!), and lay paper or cardboard on the work surface and floor.  You also need to read all the warnings for the plaster itself.

Here’s how the whole process goes around here.  I’m so grateful for our former craft shop lady who patiently taught me her system that she had perfected for over 20 years.  This is all her idea…  (Thanks, Joyce!)

Supplies needed for pouring plaster of paris moulds

Disclosure: This post contains affiliate links for your shopping convenience.

supplies needed for plaster of paris crafts
  • Bucket of clean, luckewarm water with a 1 cup scoop
  • A dirty, old bucket with water for rinsing
  • A scrub brush
  • a rubber plaster mixing bowl
  • an old knife
  • an old measuring cup for measuring the plaster powder
  • an old spatula
  • plaster moulds (See below for options for where to purchase plaster of paris moulds.)
  • wire bent for hangars

Where to purchase plaster moulds

The camp has been collecting plaster moulds for decades, so we already have a large collection! Here are some places you can purchase plaster moulds:

How to pour plaster of paris moulds for crafts

  1. Set up all the moulds so that they won’t tip when you pour the plaster in.  Boxes and cottage cheese containers work well for this:
plaster of paris moulds lined up on a table

2. When you are ready to mix, pour 3/4 cup water into the mixing bowl.

water being added to a rubber plaster mixing bowl

3. While stirring with a knife, add the plaster powder to the water.

plaster of paris powder being added to water in a rubber pottery mixing bowl

This is where it’s just a little tricky.  The amount of plaster powder needed changes depending on the temperature of the water, the temperature of the room, and the humidity in the air.  As a general rule, I used about 3 1/2 cups of powder per batch.  You want it smooth, but slightly thick, comparable to thin pancake batter.

Liquid plaster of paris mixture ready to be poured into a mould

Be careful, however, that it isn’t too thick or you won’t get it all poured out before it hardens!  Don’t worry.  After the first few batches, you’ll have it all figured out!Smile

4. Pour quickly into moulds, remembering that the plaster starts to set as soon as it hits the water…

pouring plaster of paris mixture into plaster of paris moulds

5. Shake and bump the moulds after pouring to get the plaster evenly distributed and the bubbles to float to the top.

adding a bent wire hanger into the liquid plaster of paris on the back of the mould before the mixture hardens.

6. Stick a wire hanger into the back after shaking and bumping.

wire hanger in the back of a plaster mould

One batch filled 7 small/medium sized moulds.

Plaster of paris moulds filled with liquid plaster of paris that are drying

7. Once the plaster is all poured out, scrape the bowl as clean as you can {quickly!} with the spatula. 

rinsing out the rubber plaster of paris rubber mixing bowl

Immediately rinse all tools and the bowl in the bucket of rinse water. ***This is very, very important! NEVER EVER rinse out your tools in a sink…  It would be equivalent to pouring cement down your drain!!! …

The moulds should be hardened and ready to pop out in about an hour (or less).  They actually heat up as they are curing, and then when they feel cold again, they are ready to pop out.

hardened plaster of paris in a mould ready to be removed

Simply turn it over in your hand, give it a gentle “SMACK”, and out it will come!  If you treat your moulds carefully, they will last for years and years…  Some of ours are antiques, I’m sure.

plaster of paris fish shapes that can be hung up on a wall

We repeated this process as quickly as humanly possible for 2 1/2 work days.  I lost count of how many moulds we now have…  But, I’m guessing that each 50 pound bag will yield at least 150 small-medium moulds and 60 larger ones. {We’ve poured 3 bagsful and have 2 more to go…}

As they are drying, make sure there is some air space to flow around the back of them, as well.  They are quite porous and filled with moisture, so you want to prevent mold from forming on the backs.

plaster of paris sheep and cats ready to be painted

How do you use these plaster moulds for crafts for kids and adults?

This plaster craft is slightly unusual, and is a novelty for kids and adults alike. The craft is to customize each mould by painting it. Over the 2 decades I worked at camp, this craft was always a popular one!

We used liquid washable tempera paints for the smaller kids and acrylic paints for the adults. Once the paint has totally dried, the moulds can be sprayed with a clear sealer. Then, they can be hung on the wall as a decoration using the wire hanger on the back.

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65 Comments

  1. Thanks for sharing your process, Rita! I made plaster coasters for family and friends about 10 years ago. I had forgotten how fun it was…and messy! Oh, and the feel of the dried plaster gave me the heebie jeebies…sort of like nails on a chalkboard. hehe! I can’t believe your well on your way to make 5 bag worth of molds! That’s a lot of pieces!

  2. Oh Rita, thank you for bringing back such wonderful memories! When I was a child we painted these in school as well as the youth center when we were stationed in Germany…. it was such fun but I had forgotten all about it until you wrote about them. Now I am going to have to see about getting some molds to make some decorations for hooks.

    And I must say I am IMPRESSED with the number you have poured and do pour each year!! Have a wonderful weekend!

  3. Dear manager

    good day !
    i was learnt you make plaster crafts ,right ?we are intersted your products ,i also want to know what is the material you use to make moulds ?

    kind regrads

    wenson

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