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Slush Pour your Concrete Mold

Move over ‘Chia Pets’! Everyone is allowed to be silly sometimes, so it’s my turn. Yes, a ‘head planter’ is a bit odd but it’s purpose was to test a new casting system. Make your concrete pouring simpler and see how to slush pour your concrete mold. I love this method! Besides, I could not resist that baby pout!

To start this mold making I used this cute little fellow…

And I popped his head off. (Don’t worry, he is back together now)

My inspiration is this favourite planter of mine. She has aged well and her veil keeps growing gloriously…

Find yourself some type of head or perhaps even a mask.

Before casting I needed to fill the hole on the bottom of the neck. A quick patch of  — ya, duct tape!


Tools and materials needed to make the form:

Materials to Cast and finish Concrete:


Making the Mold:

The method to make this mold is the same as my first mold making tutorial. Lightly apply some vaseline on the master shape (the head). Mix the cornstarch and silicone carefully in the bowl without getting it all stuck to your fingers. Add cornstarch (just as you would add flour when working with dough) until it becomes workable without sticking.

It should be pliable to spread it around the ‘head’ and keep pushing it till it covers up to the rim of the head and fills the bottom. Spread it until it is an even thickness of at least 1/8″ thick.

It will set in about 30 minutes. Once it is completely ‘rubbery’, you can cut up the back, or at each ear side. Remove the ‘head’, adjusting by cutting as needed. I am alway amazed at the strength of this recipe! Mold is done!

Slush Pour your Concrete Mold:

To ready the mold, use elastic bands to keep the seams closed. Since it is a round shape this works well. To ‘line-up’ any seams you can also use my trick: securing with pins. This works well, as they make sure the edges stay together and later pull out without leaving a hole.

As with many of my projects this casting method works best with a strong, rapid setting concrete. This concrete is quite ‘plastic’ and will mix better if water is added first, and then slowly add premix until it has some flow. It has a working time of about 10 minutes. The flow should be ‘slow’ and somewhat thick.

Pour it into the form and start to turn it to coat all the inside. It may take a bit of trial and error until you have the right consistency. Turn slowly and watch for the flow to eventually stop. I discovered this slush-pour method when making the ‘balloon-cast’ monster eggs.

It may not be pretty, but it is easier than having a center form. Let it sit for an hour and then repeat and pour another layer. Depending on the thickness, you may need a third layer. This concrete is VERY strong and can hold well at only 1/8″ thick.

The top edge may be a bit uneven as well, but you can sand it as desired. As a planter it looks quite nice as a ‘broken’ edge style. Don’t worry about any texture that the mold has picked up, it IS concrete afterall.

To make it look aged, use some ‘washes’ as in my antiquing tutorial.

Instant Moss:

Do you want the ‘mossy’ look instantly? I came across some of my flocking material from my days as a ‘model builder’. It is also used in model train landscaping and can be found at hobby shops.

To adhere the flocking; use a bit of matte medium. Brush it in places that would naturally grow moss; areas that would tend to be in shadow.

Sprinkle the flocking into the wet medium. It’s the same method you would use for glitter. It’s your preference how much or little. To make it less likely to continue to lose bits, add another layer of matte medium. (If you can’t find flocking maybe you could put some moss in a sacrificed blender/coffee grinder)

I have tested some sealer methods (soon to be posted) before I planted up these fellows. Succulents are my favourite as they never seem to complain and they propagate like crazy!

Quite the hairdos! But this method is not limited to heads. (more projects in the works) It is somewhat reliant on a strong mix or perhaps a thick wall of multiple pours.

Happy casting and planting!

Can’t get enough concrete projects?! Check out my concrete obsession



I’m an artist & I make things… all kinds of things.

This Post Has 19 Comments
  1. Wonderful how to video. Have you ever made owl statues for your garden from concrete and if so would you share the how to? Hope to ake some of my own in various shapes and sizes.
    Thanks Selena

  2. what concrete mix did you use? I made a mold of hands, and am not finding a concrete mix that I’m happy with. You may text message me if you would like: my number is 641 860 1064. You are a woman after my own heart. I LOVE to make things, but I am forced to work full time- which severely limits my crafty time.
    I SO look forward to hearing from you soon!
    Much Gratitude,

    1. Yes, sometimes work gets in the way of crafting! I have been using RapidSet Cementall, it is available at Home Depot here in Canada and also in the US. I have been using it indoors during the winter. (Just be careful with the dust) It is quite a strong concrete and is super fast setting.

      I hope it works out and would love to see it!

    1. I am not sure what that material is? I am familiar with drywall fibre-mesh that comes in rolls and have used that inside the stepping stones. The small fibres work well as they just mix in and flow with the concrete. I broke a tray and it held together without splitting because of the fibres. I think we could learn a lot from each other…

      Glad you stopped by…

  3. I’ve also been working/playing with the RapidSet Cementall and really like it’s strength and quick setting time. Love your work! I look forward to more posts.

    Your Faux Geode lamp instructable is wonderful. Thanks.

    1. Yes, I joke it’s better than making a cake; no baking!

      Yup, there are a few new ideas in the works. No shortage of ideas here, just time is another story. ‘Hope you are subscribed 😉

  4. Hi Barb,
    I love your concrete tutorial! You make it look so easy that I think a project of my own will be in order, as soon as I can find the time. Thanks so much for sharing your wisdom with the rest of us.

    1. Thanks! I believe everyone has more ability than they think they do. And the nice thing about concrete is that it fairly inexpensive, quite forgiving and can yield some cool results. There are more projects in the works…

  5. Hi…….love your blog and projects.

    esp this baby.

    could you estimate the size of the baby head. Maybe the circumference. Having a hard time finding a head. They all seem too small.

    thank you

    1. Thanks! This fellow has such a cute pout (being a long time doll collector) He is a ‘Berenguer’; they make great dolls. I’d say the diameter (distance across) is about 5.5″ at widest. Check the thrift stores. All the new dolls nowadays seem to have odd faces.

      Good luck!

  6. Hi Barb I would like to subscribe to your website but it will not allow me to start my email address with a lower case letter at the beginning Frances

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