Recipe · Butter

Butter slime: the slime that spreads like butter

Butter slime spreads like soft butter: a classic slime base plus soft air-dry clay. Which clay to choose, how much to use, and step-by-step instructions.

By the Slime & Co editorial team · Updated

Two kids holding balls of smooth pink and yellow dough
Photo: Nellie Adamyan on Unsplash.

Butter slime is one of the star textures of slime shops: matte and thick, it smooths out and spreads like soft butter. You make it by mixing a classic slime with a soft, lightweight modeling clay (the kind that air-dries and stays very light).

In stores, look for “soft air-dry clay” or “lightweight modeling clay” in the kids’ craft aisle, and pick one that’s still squishy. Skip oven-bake polymer clay, which is too stiff: Little Bins advises against it for this recipe.

Ingredients

Supplies: a mixing bowl, a spoon, a board or tray for kneading.

Need more or less? Recalculate the amounts for this recipe to fit your bowl or the number of kids.

Why these ingredients? What the activator does and which glue to choose.

Steps

  1. Make a basic slime: glue and water, food coloring, baking soda, then the contact lens solution poured in by an adult.
  2. Knead until the slime no longer sticks.
  3. Flatten the clay into a pancake.
  4. Lay it on the slime and knead for a long time to work it in: at first it breaks into chunks, then everything turns smooth.
  5. Spread it on the board with your finger: if it spreads like butter, you’ve got it.

How do you know it worked?

A good butter slime is smooth, with no lumps, spreads in a thin layer, and doesn’t stick. If there are still bits of clay, keep kneading; if it gets dry, add a spoonful of glue or a dab of hand lotion.

The most common slime fails

There are still lumps of clay
The clay was too dry or too old. Knead longer; next time, use a freshly opened pack.
It hardens after a few days
That’s this slime’s weak spot: the clay slowly dries out. Add a little hand lotion and always keep it sealed.
It won’t spread, it stays stretchy
Not enough clay: add a small piece and knead some more. A basic slime that’s too firm, because it got too much solution, won’t spread well either.

Another problem? The Slime Fixer goes through every symptom.

Why does it work?

Lightweight clay is made of tiny, very light beads of material held together by a binder. Mixed into slime, it breaks up its stretchiness: instead of pulling into strings, it spreads. It’s the same idea as adding flour to a dough that’s too sticky.

Variations and ideas

How to store it

An airtight container is a must: this is the slime that dries out the fastest. If the surface forms a crust, peel it off and add a drop of water or lotion.

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