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If your slime is hard and won't stretch add lotion. Lotion makes your slime stretch and less hard. Just don't put lotion and water in a cup then pour it into your slime, it makes it watery.
If you want to make your slime bubbly you add foaming hand soap. If you don't add foaming hand soap and you leave your slime in a container it won't have bubbles on it.
If you leave your slime out it will harden and you can't fix it easily. So always keep it in a container.