Answer:
I am a kind of coat that can only be put on when wet. What am I?
If you have me you want to share me. If you share me you don't have me. What am I?
I need to be taken before you can have me. What am I?
I am a rock group that has 4 members, all of whom are dead, one of which was assassinated. What am I?
What comes in many different sizes but is always only 1 foot long?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.