I bought the Yardley Gel-Lac Nail Polish in Overcoat after a nail-biting spree. My nails are so thin at the moment, the 'volumising' claims immediately appealed to me.
This really is a great topcoat. It made my cheap nail colour look like a proper manicure. It leaves a beautifully smooth finish which my cheaper topcoats often don't. I also painted my nails right before bed and didn't wake up to any duvet marks or smudges! Very quick-drying and really improved the look of my bitten nails.