Soda:
He freaking loves it. You guys made it together, so he would add extra glitter when you weren't looking, and he would throw the slime at you, resulting in a slime fight.

Dally:
He doesn't want the gang knowing, but he really likes slime. He will make you get him some and he'll carry it around and mess with it. It helps with his anger issues.

Darry:
He doesn't really have time for it. If you show him the slime, he'll just give it a nod. He doesn't see the hype about it.

Johnny:
Johnny would be the type to fidget. He'd have all the fidget toys, because Two-Bit would steal them for him. He'd love slime, and ask you to make it with him all the time.

Ponyboy:
He's okay with it. He'll play with it, but like Darrel doesn't really see what's so great about it.

Two-Bit:
Loves it. He literally makes it all the time, and just throws it at the gang when they don't expect it.

Steve:
Her doesn't really care for it. He thinks it's cool, but he gets mad when his doesn't turn out right.

Tim:
Hates it. He claims slime is for faggots and he'll just throw it out anytime you make it.

Curly:
He thinks it's cool. He's the type to watch those satisfying slime videos, but get really embarrassed if anyone knew.