Make your own fluffy slime

What can I use if I can't find white school glue, shaving cream, or the 'safe activator' listed in the steps?

You can substitute clear school glue for the 1/2 cup white glue, use 1 cup of white foaming hair mousse instead of the shaving cream, and replace the 1/2 tablespoon of 'safe activator' with 1 tablespoon of liquid starch.

My mixture never pulls away from the sides of the bowl or the slime stays very sticky—what should I do?

If the mixture doesn't pull away at the stirring step or the slime is sticky after kneading, add another 1/4–1/2 tablespoon of the safe activator a little at a time and knead on the paper towel until it becomes stretchy and less sticky.

How can I adapt this fluffy slime activity for younger kids or make it more challenging for older kids?

For younger children, pre-measure the 1/2 cup glue, 1 cup shaving cream, and 1/2 tablespoon activator and have an adult do the mixing while the child folds and kneads, and for older kids let them vary shaving cream amounts, try different food coloring blends, or test adding glitter/foam beads at the optional step to explore texture changes.

Any fun ways to personalize or extend the slime after it's made?

Add a drop of fragrance when you add the food coloring, fold in glitter or foam beads at the optional step for extra texture, or make two colored batches and swirl them together while kneading to create marbled slime to share on DIY.org.