The Plaster Sphere

Introduction: The Plaster Sphere

About: I'm an Artist and Fabricator and a Cantankerous old coot Married with children Worked in the Aerospace industry for years retired love to tinker and build mold and sculpt any medium is fun to build in experi...

Big Fun with plaster and Gauze .

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Plaster Shere

6 Hours

Get yourself a 12 concrete mold 1/2 round they are made for concrete yard I bought the molds from a store on ebay called gostatue they were US $15.25 each i used them during the summer to make h lf spheres for my drive way edges and walk ways it's almost winter so pouring concrete is not really an option so why not play with them with some plaster 

Step 2: You Will Need:

Face mask breathing dust of any kind is not healthy be safe !

Plaster of Paris 
A few mixing vessels
A Stiff stick and small putty knife 
Some cheesecloth or Gauze 
A throw away paint brush or two
Silicone Spray 


Rubber Gloves 
A drill and 1/8" drill bit 
Air Compressor 
A Debris Blower with a small Nozzle

Step 3: Making the Halves

Spray your mold with Slicker Mines silicone based makes it nice and slick mix your plaster and brush the inside of the mold with the first coat after the first coat starts to set up lay in your gauze and mix up another batch quickly brush it in your mold and get ready to mix another batch .
I put 5 layers in my sphere with one layer the 4th layer being a build up on the edge so that when i meet up the edges they have something to rest upon each other just the brushed edges would be to thin to hold up .

Keep your brush clean between coats plaster will set up under water so you have to keep it banged out real good and while your puting coats on dip the brush in the water once in a while to keep it damp but not soaking wet .

Step 4:

I used an air blower and a compressor to remove my halves from the molds they pop right out with air if you wait for them to release by themselves you have to wait until the plaster drys a bit through the surface tension and water in the mold will make it hard to get out Vacuum is a booger !

Step 5: Putting the Halves Together

 On this half of the sphere you will use the leftover gauze on and when the two are blended together it will be used to hold them tightly together and finish your spere with several thin coats of plaster to hold it together .

Step 6: The Start of Something Fun

I drilled 3/8" holes in both sides so the inside could dry out as well i figure it should take about 3 weeks for this to dry fully and then i can start working on painting it up looks like the moon to me makes me think of werewolves and bats !

Be the First to Share


    • Fandom Contest

      Fandom Contest
    • Jewelry Challenge

      Jewelry Challenge
    • Backyard Contest

      Backyard Contest

    2 Discussions


    7 years ago on Introduction

    Neat! What are you going to do with your plaster sphere?


    Reply 7 years ago on Introduction

    Well as soon as it dries which will take almost 3 weeks inside and out i thought about painting it like the moon and maybe engraving it with something appropriate