How To Make Spooky Halloween Monster Slime (No Borax!)

Create this Spooky Halloween Monster Slime! An easy 3-ingredient recipe using clear glue, baking soda, and contact solution for spooky, glittery fun kids will love!

Halloween is the perfect time to get a little spooky and a lot creative, and what better way to entertain the kiddos (and yourself) than by making some Spooky Monster Halloween Slime?

It’s easy, inexpensive, and a super fun sensory play activity. Plus, it’s the perfect way to get into the Halloween spirit without too much fuss or mess.

Why Make Spooky Monster Halloween Slime?

There’s something truly magical about DIY slime like this Spooky Halloween Monster Slime. First, you control all the ingredients, no hidden chemicals or mysterious additives. Second, it’s a fantastic hands-on sensory play activity that combines fun and learning.

But the best part? DIY Halloween slime is endlessly customizable! We made ours monster-themed with spooky green food coloring, sparkly green glitter, and creepy googly eye balls. You can toss in mini monster figurines, black confetti, or tiny Halloween trinkets for that creepy-cute vibe. Your imagination is the only limit.

Why Seasonal Activities Are Awesome

Seasonal activities are a fantastic way to mark the changing seasons and get kids excited about upcoming holidays. They create lasting memories, and it’s something the whole family can look forward to each year.

Whether you’re hosting a Halloween party, having a monster-themed playdate, or just looking for an afternoon project, Halloween sensory activities like this Spooky Monster Halloween Slime always add a little extra fun to the mix.

The Best Halloween Monster Slime Recipe

Ingredients

To make this Halloween Monster Slime recipe, we used our classic Clear Slime Recipe but with a Halloween twist. You’ll need the following:

• 1/2 cup Elmer’s Clear Glue
• 1/2 cup Warm Water
• 1/2 teaspoon Baking Soda
• 1-2 tablespoons Contact Lens Solution (make sure it contains boric acid or sodium borate): We used Bauch+Lomb Renu.
• Optional: Food coloring, Glitter, googly eye balls, tiny monster trinkets, or Halloween confetti to create that perfect spooky monster look!

Instructions

1. Mix Your Baking Soda and Water

In a separate small bowl, dissolve 1/2 tsp baking soda into 1/2 cup warm water. Be sure the baking soda dissolves completely and then let the mixture cool slightly. This ensures you won’t get a sticky or runny slime later on.

2. Add Glue

Add 1/2 cup clear glue to a mixing bowl.

3. Combine Glue and Water Mixture

Slowly add the water and baking soda mixture to the clear glue in the mixing bowl. It’s important to stir gently so that you don’t create too many bubbles. Fewer bubbles in this step means clearer slime in the end! If you’re really trying to get that perfect crystal-clear look, slow and steady wins the race.

4. Make It Monster-ific!

Now’s the time to make your Halloween Monster Slime truly spooky and fun. We added a few drops of green food coloring to give it that slimy monster vibe, mixed in sparkly green glitter and Halloween confetti for a shimmery effect, and tossed in some googly eye balls to bring your slime monsters to life!

Pro Tip: The more you mix in, the cloudier your slime might get. If keeping it clear is your goal, stick to glitter or very small items.

5. Add Contact Solution

Slowly stir in your contact lens solution (start with about 1 tablespoon). You’ll notice the mixture starts to firm up and pull away from the sides of the bowl.

If it’s still too sticky after mixing and not pulling away from the sides of the bowl, just add a little more contact lens solution, a little bit at a time (up to about 2 tablespoons total). Be careful not to overdo it though, or you might end up with rubbery slime instead of that smooth, stretchy texture you’re aiming for.

6. Knead the Slime

Time to get hands-on! Add a couple of drops of contact solution to your hands and knead the slime in your hands for a few minutes. Kneading helps the slime become less sticky and gives it that perfect stretchiness.

If it’s still a little too sticky, just keep adding tiny amounts of contact solution until it reaches the right consistency.

Tips and Tricks For The Best Spooky Halloween Monster Slime

Too Sticky?

If your slime is sticking to everything, add just a few drops of contact lens solution and keep kneading. Be cautious not to add too much at once. Clear glue slime is naturally firmer than white glue slime, so it’s all about finding that perfect balance.

Cloudy Slime?

It’s completely normal for your slime to look cloudy right after mixing. If you mixed it too quickly or squished it too much while playing, that introduces more bubbles into the slime. No worries! Just let the slime sit in an airtight container for a few days and the bubbles will work their way out. For an extra-clear result, stir gently during each step.

Choose the Right Contact Lens Solution

Check the label of your contact lens solution to ensure it contains boric acid or sodium borate. This is the key ingredient that activates the slime. We used Bauch+Lomb Renu and it worked really well, but the amount of boric acid can vary between brands. If your slime isn’t coming together as expected, try adjusting the amount of contact solution.

How to Store Your Spooky Monster Halloween Slime

Once you’ve perfected your Halloween Monster Slime recipe, it’s important to store it properly so it lasts as long as possible. Keep your slime in an airtight container when you’re not playing with it. This will prevent it from drying out. This Halloween slime recipe can last for several weeks depending on how much you play with it.

If the slime starts to feel too firm after a while, you can knead in a tiny bit of water to soften it up again.

Get Ready for Spooky Fun!

Now that you’ve got the ultimate Halloween Monster Slime recipe, it’s time to make this Halloween extra spooky and fun! Whether you’re crafting with your kids, hosting a monster-themed party, or just looking for a fun DIY, this homemade slime is a surefire hit.

Ready to make your own Monster Halloween Slime? Let me know how it turns out in the comments below.