2 coats
Mariner is a very interesting color. I don't own anything quite like it. It's almost black, but there's a blue-green tint to it that adds some intrigue. The finish is also ultra shiny. If you're a fan of nearly black shades, this is a great one to have.
Sadly, this is the last swatch of Butter London week. I planned to swatch one more (Henley Regatta), but I have a pretty bad cut on my finger and it makes polish removal very painful and difficult. Instead, I will be posting a couple swatches I've been too lazy to edit for a while now. As soon as my finger gets better, I will start swatching my American Apparels.