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!

This quick and easy homemade Gak recipe is the perfect DIY activity for kids.

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.)

This quick and easy homemade Gak recipe is the perfect DIY activity for kids.

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.


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

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

…and mix with a spoon.

stirring gak2

Step 2: Add the food coloring…

homemade gak food coloring…and stir in well.

spoon gak

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

Homemade Gak borax

Stir until the borax is dissolved.

water borax

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

making Gak

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

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

This quick and easy homemade Gak recipe is the perfect DIY activity for kids.

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.

This quick and easy homemade Gak recipe is the perfect DIY activity for kids.

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

This quick and easy homemade Gak recipe is the perfect DIY activity for kids.

At the same time, it will slowly spread.

This quick and easy homemade Gak recipe is the perfect DIY activity for kids.

This quick and easy homemade Gak recipe is the perfect DIY activity for kids.

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

About the Author

Erika is a happily married mom with four energetic children. With a love for Jesus, photography, organizing, and encouraging other moms, she stays busy and definitely does not have it all together.


  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!

  7. You are a featured on tonights link up! http://milkandcuddles.com/2013/05/best-wednesday-linky/ Thank you for joining our linky and we hope you link up more!
    Shannon Schmid recently posted..Best Wednesday Linky – Link Up Ever!My Profile

  8. Howdy! Someone in my Facebook group shared this site with us so I came to check it out.
    I’m definitely loving the information. I’m bookmarking and will be tweeting this to my followers!
    Wonderful blog and fantastic design and style.
    Marek Novak recently posted..Marek NovakMy Profile

  9. David Smith

    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.

  10. Hi! I would love to make this for my children, but I can’t get any Borax. Is it necessary? My kids are so sad, please say we don’t need it!! Please respond :)

    Mom of 6 kids (A lot, right?)

    • Sandy, thanks for stopping by! Borax is actually an essential ingredient in the consistency. Without Borax, I don’t think it would be quite the same. You could definitely give it a try but I just don’t know how it would turn out. On another note, you can find Borax at Walmart, grocery stores, etc. – it’s by the laundry detergent and is pretty cheap too. Hope that helps!
      Erika recently posted..Our Incredible Kids #Fridgworthy MomentsMy Profile

  11. I’d love to watch the video of Nathan playing with the Gak, but when I click on it, it just says, “This video is private” :(

  12. I just made this for my kids. Especially my son who has Autism and uses GAK at school on a daily basis. I was wondering of it needs to be refrigerated or kept out at room temperature? As how long will it last in the containers?

    Thank you, Melissa


  1. Homemade gak {science crafts for kids} | CutePinky SocialBookmarking says:

    […] http://musingsfromasahm.com/2013/05/homemade-gak-less-than-5-minutes/ […]

  2. […] 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. […]

  3. […] 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 […]

Speak Your Mind


CommentLuv badge