Answer:
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
When I live I cry if you don't kill me I'll die.
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath.
You use me from your head to your toes. The more I work, the thinner I grow. What am I?
I go into the water black and come out red. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?