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Project

Spider Eggs

Decorations like these are simple to create and make a spooky addition to any haunted house or Halloween bash.

Materials

  • 8 ounces of plaster of paris
  • 4 ounces of water
  • 12-ounce or larger plastic bottle (empty with cap)
  • 12-inch round balloon (helium quality)
  • Balloon pump
  • Tub of water (shallow Sterlite bin)
  • Utility knife
  • Small hammer
  • Glow sticks (available at glowproducts.com)
  • Glittered plastic spider
  • Craft glue
  • Spanish moss

Steps

  1. Step 1

    Turn bottle over. Squeeze bottle gently several times; plaster will begin filling balloon. (Not all of the plaster will make it into the balloon.)

  2. Step 2

    Let the balloon dry overnight.

  3. Step 3

    Insert balloon pump and inflate balloon; it should reach a 6- to 8-inch diameter.

  4. Step 4

    Remove balloon opening from bottle mouth.

  5. Step 5

    Remove balloon and tie firmly.

  6. Step 6

    Roll it around for about a minute, trying to evenly distribute the liquid within.

  7. Step 7

    Begin rotating balloon gently in your hands.

  8. Step 8

    Place balloon in tub of water to set so it won't dent while the plaster is drying.

  9. Step 9

    Use the utility knife to create cracks around the hole.

  10. Step 10

    Remove the balloon by lightly dragging a utility knife across the surface.

  11. Step 11

    Glue glittered spider near hole.

  12. Step 12

    An "egg" will often have a hole that can be made by tapping the egg with hard instrument. Try to find a thin shell area and continue tapping and chipping away at the fragile surface until you have an opening you like.

  13. Step 13

    Pre-inflate balloon and let air out so it stretches.

  14. Step 14

    Mix 12 ounces of plaster and 6 ounces of water in the bottle. Shake vigorously for 20 to 30 seconds.

  15. Step 15

    Stretch balloon opening over mouth of bottle.

  16. Step 16

    Set egg in small urn or other egg cup; style it with Spanish moss to create a nest.

  17. Step 17

    Drop a glow stick through the initial hole.

Source
The Martha Stewart Show, October 2007

Reviews (13)

  • glowsticks21 30 Nov, 2013

    The hydrogen peroxide oxidizes the TCPO, to form trichlorophenol and an unstable peroxyacid ester. The unstable peroxyacid ester decomposes, resulting in phenol and 1,2-dioxetanedione. The dioxetanedione complexes with the dye molecule and releases light. In Mechanism (1) the dye does not decompose or become inactive after emmitting light while in Mechanism (2) it is inactive after emitting light.
    More about glow sticks

  • Vintage_harvest 23 Oct, 2010

    I attempted this but couldn't get it to work. I was confused about measurements and I didn't have a funnel so it was difficult to pour into the balloon. I went to Michaels and grabbed a roll of plaster (messy but just got out the old newspaper). Blew up the balloon (not too large) dipped the plaster into water and covered. It looks awesome because of the fabric and layered look. Thanks for the idea! It will look awesome with the glow in the dark spiders!

  • LadyPersia 15 Oct, 2010

    The directions dont read correctly. Tools states 8oz of plaster and 4 oz of water but the How To is different. I have tried this once and failed. I am going to try it again. Which measurements did you use?

  • michellebabb71 8 Oct, 2009

    I have been making these for 2 years now and sometimes you get good ones and sometimes they are too thin. Last year I made a [filtered word] in the back and put purple lights in side of them. They looked awesome!! I can't wait to do it this year!

  • Edenza 1 Oct, 2009

    I tried these last year and they were so thin, I crumbled the "eggs" when slicing the balloon. Heed the advice and use a LOT to make a nice thick egg. I'll try again this year but last year, it was a frustrating mess.

  • CutiePatootie 7 Oct, 2008

    Decorated my office at work with these. Added spiders on the outside and placed in light green "moss". They look amazing! I got a lot of compliments too.

  • CutiePatootie 6 Oct, 2008

    I used a good sized funnel to aid in the transferrance of the plaster powder into the bottle as well as the plaster mixture into the balloon. Trust me, it make life a whole lot easier. Plus you can reuse your bottle over and over again instead crushing it out of shape for one or two eggs.

  • janaiguana 22 Sep, 2008

    Started on these yesterday, realized as I was making them that the Materials List and the Instructions call out differing amounts of plaster and water. USE THE LARGER AMOUNTS and don't over inflate your balloon or it gets way too thin. I'm going home to see how they turned out, I can't wait!

  • Lander 16 Sep, 2008

    We attempted this project the other night. Our first egg turned out amazing. However, for the second egg, we made the mistake of reusing the bottle. Bad idea- don't do this!!! A small piece of dried plaster left in the bottle punctured the balloon as my boyfriend was turning it to coat the inside. The most incredible explosion "plastered" my living room - couch, TV, walls, ceiling, etc. I am still cleaning this out of my rug with vinegar. Do this outside to be safe!

  • Rachel-Nicole 11 Sep, 2008

    These look so cool! Wonder if you take take them outside or if the rain and weather would mess them up?

  • FannyBrite 7 Sep, 2008

    These are so effective and fun! The shell was quite 'thin' so I'll make another one using more of the mixture to ensure that the balloon is full. The end result is great and the glo stick works well! Can't wait til Halloween.

  • carlacan 1 Dec, 2007

    i made this last nite using 8oz of plaster of paris and the 4 oz of water but then i threw a twist on it and added red powder paint to make it a christmas ornament. it worked great and looked wonderful. what was left, i was doing it on my lap instead of a steady surface, so as it was rolling towards the floor i grabbed it and cracked it. But i know now i can change it from spider egg to ornament.

  • mdee 6 Nov, 2007

    These are awesome