What's the difference between a DIY slime kit and a premade slime kit?

DIY kits (like Elmer's Color Rush or Fruity Fusion) give you glue plus activator and the kid does the chemistry, that's part of the fun but also where most failure stories come from on r/Slime. Premade kits (like the FunKidz 33-cup or Ultimate Slime Kit) ship slime already mixed in pots, so kids just play and add mix-ins. Premade is more reliable; DIY is more educational.