sunscreen application

I was curious as to how many people apply sunscreen on a daily basis, how much, and how often that you reapply. I’m stumped by Gwyneth Paltrow’s application like a highlighter on the Vogue video. I apply two layers usually under my makeup. My mother instilled this in me, to use sunscreen. I didn’t think someone like GP would show that she doesn’t really use it properly! What are your thoughts?