This watermelon slime is bright, stretchy, and full of summer fun! With its glossy red colour and black seed details, this fruit-inspired slime is a super fun sensory activity for kids who love colourful slime recipes.
It’s perfect for summer parties, watermelon or fruit themed crafts, camp activities, or a sunny afternoon at home. The red slime stretches and squishes like classic homemade slime, while the little black seeds add a playful texture that makes it look just like a slice of watermelon in slime form.
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How to Make Watermelon Slime
Materials:
See the craft in action:
Instructions:
Step 1: Find what you need
- Gather your supplies and materials.
Step 2: Make the watermelon seeds
- To make the watermelon seeds we’re going to use black polymer clay.
- Condition a small ball of the clay by stretching it and squishing it in your hands until it’s soft and workable.Then break off small pieces of the clay for each of the seeds.
- Roll a clay piece between your finger tips and then flatten it down. Use your pointer finger and thumb to gently squish one end of the clay, shaping it to a gentle point.
- Repeat until you have a small parchment-lined tray of seeds.Bake in the oven according to package directions (ours recommends 275F for 15 minutes per 1/4 inch thickness.)Allow to cool before handling.
Step 3: Mix the first slime ingredients
- Pour 1/2 cup of clear glue into a bowl.
- Add 1 teaspoon of baking soda. Stir well to combine.
- Stir in a few drops of red liquid watercolor paint (or food colouring) to colour the slime.
- Then you’re going to add as many of the clay watermelon seeds as you’d like.
Step 4: Activate the slime
- Add 1-1/2 teaspoons of contact solution into the glue mixture.You may need to add more later, but start with this smaller amount.
- Stir until you can’t stir anymore and the slime comes away from the bowl.
- Pick up the slime and squish it with your hands. It may be a bit sticky, but it’ll get less sticky as you work with it.Because of the add-ins it’s good if the slime is still a bit sticky, as it gets less stretchy as it sits. Add more contact solution only if necessary, a few drops at a time.
- Optional: Place the slime in an airtight container and let sit overnight. This releases air bubbles and helps the slime become more clear.
- Your watermelon slime is complete!
Helpful Tips:
- Add the contact lens solution slowly, stirring well between each addition. If the slime is still sticky, add only a few drops at a time. The watermelon seed add-ins can make the slime firmer than usual after it sits overnight, so it’s okay to leave the slime a little sticky at first.
- For an extra sensory element, add a few drops of watermelon fragrance oil to the slime mixture. It makes the slime smell sweet and summery, which is such a fun match for the bright watermelon look.
What can I use to represent the watermelon seeds in this slime recipe?
Black polymer clay definitely makes the best watermelon seeds. You can make them just the right size and shape. But if you don’t want to go to the effort you can also use:
- pony beads
- seed beads
- bugle beads
- small pom poms
Uncooked black beans can also look great as watermelon seeds, but you’ll need to keep a close eye on the slime, since mixing the moisture of the slime with a food product means it won’t last as long. We recommend using one of the other ideas listed above.
What should I use to colour my watermelon slime?
Liquid watercolour paint gives the brightest, truest red colour, making it a great choice for watermelon slime. Food colouring and acrylic paint are other good options, or you can use mica powder if you want the slime to have a pretty shimmer.
What’s the best glue for watermelon slime?
Clear glue works best for watermelon slime because it lets the red colour shine through and gives the slime a juicy, slightly transparent look. This also makes it easier to see the black watermelon seeds mixed throughout the slime.
You can use white glue if that’s what you have on hand, but it’ll make a more opaque, pastel-looking slime. It’s still fun to play with, though the seed pieces won’t stand out quite as much.
How can I make this watermelon slime even more fun?
You can try adding small clay watermelon slices to the slime instead of (or in addition to) the seeds. You can use a green bowl or container to store your slime, so it looks like a watermelon rind. You can also make simple watermelon accessories from craft foam or construction paper to decorate the play area.
For an extra fun activity, compare the slime colours and texture to a real watermelon, then enjoy a watermelon snack after you’ve washed your hands.
This watermelon slime is a squishy, stretchy, and super fun summer activity that looks just like a juicy slice of watermelon! The bright red colour and little black seed pieces make it extra playful, while the glossy texture gives it that perfect fresh watermelon look.
Whether you add a watermelon scent, use handmade clay seeds, or stash it in a green bowl for the full watermelon effect, this slime is such a fun sensory craft for kids. It’s colourful, creative, and perfect for summer parties, rainy afternoons, or anytime you want to make a slime recipe that’s as cute as it is fun to play with.
Here’s even more fruit craft ideas:
Fruit and Vegetable Painted Rocks
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Low-Mess Crafts for Kids Book
72 cute and fun crafts that kids and parents alike can enjoy. All with as little mess as possible!
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