Answer:
I am a caribbean shape that makes ships disappear
People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?
I smell like blue paint pours like green paint and I look like a red truck.
I am so delicate that even mentioning me breaks me. What am I?
I am always running but I never get tired or hot. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.