Reusable Baking Soda Volcano

Make a reusable baking soda volcano
My son has been asking to make a baking soda volcano for weeks. And I’ve wanted to make one with him… but not a single-use volcano. I want one that will hold up to multiple blasts – one that we can enjoy all summer long. I came up with a way to make a long-lasting baking soda volcano that my boys and I could craft together… and that’s what I’m sharing with you for the Summer Survival Series I’m participating in. Kara from The Joys of Boys is a fellow crafter and blogger with FOUR boys (I love my two, but don’t know if I could survive double the kiddos). Kara invited a bunch of us to share some fun crafts for her Summer Survival Series. So, you want to know how to make this baking soda volcano? Let’s start by gathering up supplies!

supplies for baking soday volcano

You need:
Styrofoam Cone
Foamcore for base (cut smaller than a tray or baking sheet)
Glass bud vase with straight sides
Smooth Finish for Styrofoam
Plastic spoons
Sharp Knife
Spoon (a long-handled spoon like an iced tea spoon works great)
Hot Glue
Brown and green Paint
Martha Stewart Decoupage (you can use another brand, but this one is water resistant)

You’ll need to cut off the top of your Styrofoam cone. Push your vase down on top of the cone to make a mark.

mark top edge

Cut several inches down from the mark. I ended up cutting more after cutting this.

trim top of cone

Hollow out the center of the cone to take the vase. The easiest way to do this is to push the vase into the base of the volcano to make grooves, then scoop out the styrofoam from the middle using a spoon. You can save the chunks you dig out to make rocks around your volcano later.

cut into bottom of styrofoam

You can push the vase in from the top as well. If your top cracks a bit, don’t worry about it. You can use the smooth foam later to cover up any cracks.

smooth finish cracks

Once the vase fits inside, glue it to the foamcore base with hot glue.

glue to base

Now it is time to have fun. Use plastic spoons to apply the Smooth Finish to the styrofoam. We ended up using our fingers as well, but be sure to read the label warnings – it does contain VOCs. Don’t worry about making the sides smooth, go for a rocky, bumpy texture… just like a real mountain!

apply smooth finish

Let the volcano dry for at least 5 hours – overnight if you have lots of thick Smooth Finish.

Allow Smooth Finish to dry

Time to paint! All the guys got in on this one… we started with a coat of light brown paint, then smudged in some dark brown on top.

family painting together

After the paint dried, I added a layer of Martha Stewart Matte Decoupage over the whole thing. It is water resistant (the bottle actually says dishwasher safe!), so it will help our volcano to hold up to multiple uses.

paint with second color

All we have to do now is add a couple tablespoons of baking soda into the vase, and add about 1/4 c of vinegar tinted red with food coloring… then watch my boys dissolve into giggle fits as it explodes all over the place! I love being a mom to boys!

making a baking soda volcano

And check out all these other great projects as part of the Summer Survival Series!

Summer Survival Series Button 250



  1. What a brilliant idea!! I am going to share on Instagram and Twitter!

  2. Oooh I love the idea of a permanent set up!

  3. What a great idea–reuseable-who would have thought! ­čÖé


  1. […] Reusable Baking Soda Volcano from 30 Minute Crafts […]

  2. […] series we are focusing on creating, crafting and building.┬á Today’s post is a fun and easy Reusable Baking Soda Volcano from 30 Minute […]

  3. […] I’m so excited to be participating in a fun summer survival series for anyone raising boys, hosted by Kara at The Joys of Boys. It ┬áincludes several weeks of fun ideas on a variety of topics that you can do to beat summer boredom with your kiddos. They have already had a couple of weeks with great ideas, so be sure to check it out. A couple of my favorites are the paracord bracelets and the homemade reusable volcano! […]

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