Can this be used for smooth legs?
I certainly hope so. You haven't had a chance to use it yet. Mine just arrived. Ask me tomorrow. Then I will have an answer.
What is the warranty on this?
There is nothing about a listed warranty and documentation that comes with this article. However, I went to the website and it says it comes with a 90 day warranty. However, I'm not sure if you have to order it on the website to get the warranty.