I've recently bought a whole bunch of Barry M nail varnishes (including two of their super new ones!) and this is one of them! I'm pretty impressed with it to be honest, it applied completely opaque with just one layer although two did help it last longer. I'd say you have to apply pretty swiftly though because it starts setting very quickly. I wish it was just slightly more reflective though - like actual foil, but apart from that I really like it!
Do you have a favourite metallic nail varnish? Or tried the other two foil options from Barry M?