If you don’t have Borax, try using contact lens solution (one that contains boric acid) as a substitute. Simply use 1 to 2 tbsp (15 to 30 mL) of contact solution in the slime instead of the Borax and water mixture. [1] X Research source

Try using a colored or glitter school glue to make your slime even more fun.

Not adding enough water could cause the slime to crumble and become cakey, while adding too much could cause it to thin out.

Think about adding other mix-ins like glitter or miniature styrofoam balls to add more texture to your thick slime.

Try not to add too much activator to your slime, as this can cause your slime to become stiff and break. If this happens to you, simply mix in some extra glue. [7] X Research source

Store your slime in an airtight container for up to 2 weeks. [9] X Research source

If you’d like extra glossy slime, use ½ cup (119 mL) of Glue-All and ½ cup (119 mL) of clear glue. [11] X Research source

Try using a scented lotion to make your slime even more soothing. Consider the color of your lotion before adding it, as the color may affect the color of your slime.

Consider using a scented conditioner that matches your lotion’s scent.

Try adding a few drops of food coloring to your mixture for even more fun.

The more activator you add, the denser your slime will be. You may use all of the activator or you may not use much at all, and that’s okay!

Store the slime in an airtight container for 2 to 3 weeks or until it becomes hard.

If you don’t have liquid starch, make a substitute by combining 1 tbsp (15 mL) of cornstarch with ¼ cup (59 mL) of water.

Store this thick slime in an airtight container for 3 to 4 weeks or until it dries out.

Try using a plastic storage container with a lid to make your slime. This way, you won’t have to transfer it to an airtight container or cover it later.

Don’t get discouraged if it takes a while to mix everything together—that’s perfectly normal! Thick slime requires a bit more mixing than ordinary slime.

Keep your slime in its container for up to 3 weeks or until it starts drying out.