Homemade Gak in Less than 5 Minutes

My oldest son, Nathan, loves science and is always asking to do experiments. His most recent interest is chemistry. So when he came home from his weekly science class with a recipe for Rubber Blubber aka Homemade Gak, to say he was excited is an understatement.

Using simple ingredients – borax, glue, and water – this recipe is fascinating to watch as two liquids come together to form a solid. Or is it still a liquid? Because homemade Gak does move! Try it with your own kids and decide for yourself!

Homemade Gak

Another plus: homemade Gak takes less than 5 minutes to make! It’s incredibly easy. Nathan can make it all by himself.

Homemade Gak is the perfect solution to keeping kids occupied on any rainy (or too hot) day.

One word of caution – with a tiny amount of borax in this recipe, I wouldn’t let small children (who may try to eat it) play with it. Instead, I recommend making homemade playdough (also easy and can be made in less than 10 minutes.)

homemade gak recipe2 Follow Me on Pinterest

Not only is making homemade Gak a cool science experiment, but it’s also just plain fun. My kids play for hours with their homemade Gak.

Ingredients:

4 ounces school glue
4 ounces water
1/2 teaspoon Borax
1/4 cup water
food coloring (optional)

*Note: this makes a nice big bunch of Gak; you can easily half the recipe and make two different colors.

Homemade Gak ingredients Follow Me on Pinterest

How to Make Homemade Gak in 4 Easy Steps

Step 1: Pour the glue into a small container with the 4 ounces of water…

Homemade Gak step 1 Follow Me on Pinterest

…and mix with a spoon.

stirring gak2 Follow Me on Pinterest

Step 2: Add the food coloring…

homemade gak food coloring Follow Me on Pinterest …and stir in well.

spoon gak Follow Me on Pinterest

Step 3: Dissolve 1/2 teaspoon of Borax with 1/4 cup of warm water.

Homemade Gak borax Follow Me on Pinterest

Stir until the borax is dissolved.

water borax Follow Me on Pinterest

Step 4: Pour the borax water into the glue mixture.

making Gak Follow Me on Pinterest

This is where it gets interesting. At first glance, it may look like your Gak experiment has failed, but stir it up and you’ll see the magic….er chemistry…happen.

stirring Gak Follow Me on Pinterest

Stir the gak until it’s become more solid and is forming around the spoon. Watch and be amazed. It is really cool.

solid gak Follow Me on Pinterest

I recommend waiting to handle it until the food coloring is well mixed in. Nathan was a little eager to start playing with his homemade Gak and ended up with slightly blue hands. That and he got excited and added a little too much food coloring to start with. Somehow that shouldn’t have surprised me.

holding Gak Follow Me on Pinterest

Kids can do so many fun things with Gak. Did you know it will bounce?

bouncing gak Follow Me on Pinterest

At the same time, it will slowly spread.

homemade gak collage Follow Me on Pinterest

homemade gak sheet

Have fun making homemade Gak with your kids!

Watch this video, Nathan and I made where he explains more about Gak, also called Rubber Blubber, and demonstrates how it can do cool things, like bounce:

 

Click here for the printable recipe:

Homemade Gak Recipe

Erika
About the Author

Erika, the founder of Musings From a SAHM, is happily married and a homeschooling mom to four children. She lives in New Hampshire and has a passion for writing, encouraging other moms, her family, and Jesus. She also enjoys baking, spending time with friends, and is an aspiring photographer.

Comments

  1. I had no clue you could make this. I buy the kids GAK because they love it. So doing this with them!
    Nichol recently posted..Pump It Up Save Childhood Support Imagination Initiative plus Four Pack Free Pop-In Playtime Passes GiveawayMy Profile

    • I used to buy it too, Nichol. I was so excited when I found this recipe and discovered how easy it is too!
      Thanks for stopping by! :)
      Erika recently posted..Homemade Gak in Less than 5 MinutesMy Profile

      • I was wondering how long the Gak lasts. I want to make it and separate it into sandwich baggies as party favors for my daughter’s 6th birthday party, but I also want to make sure to put a label on the baggies to let parents know when to toss it. We are also making homemade playdough, with a recipe that lasts up to 3 months.

        • My son’s batch lasted for over a month before he left it out and I threw it away. Haha. I would say a month to be safe, but it would likely be fine for longer. Great idea for party favors! Have fun!
          Thanks for stopping by!

  2. I have got to make this for my oldest!

  3. This looks like so much fun!! And very similar to the recipe we used for homemade bouncy balls last year so I’m sure I still have all of the ingredients on hand.
    Danielle recently posted..Making Dreams Come True with Huggies® Little Hands, Big PlansMy Profile

  4. My boys love GAK! We are going to make this as soon as school gets out for summer next week! They are super excited!
    Amber Edwards recently posted..DIY Pallet Garden; How to make Raised Wood Pallet Garden BedMy Profile

  5. This is awesome. Perfect for a summer activity for my children. Thanks for sharing.
    Crystal recently posted..WindPro Umbrella Review + GiveawayMy Profile

  6. My son would love this! We’ll have to make some this summer!

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  10. David Smith
    Twitter:
    says:

    My son used to like this stuff when he was younger. If I had known that we could make it ourselves, that would have been fun to make with him and we would have saved a little money since every school year we always found glue for dirt cheap. Thanks for the recipe and info.

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Trackbacks

  1. [...] There are plenty or instructions for making Gak to be found on the web, here is a good set for GAK in five minutes! Borax is hard to get hold if in the UK and needs to be handled with care. I purchased mine on line. [...]

  2. […] how it will go: The children will first plunge their hands into a big pile of shaving cream or gak that has toy insects hidden deep inside. Once they pull out an insect, they will dunk it into the […]

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