The polish went on smoothly, although I was surprised to see tiny little lumps in it. It turns out that these are the concrete effect and build up as you add more coats of polish. This is completely different to the leather look polish which goes on shiny and dries out to a matte finish.
Two coats gave a really opaque finish and I was pleasantly surprised at how the effect looked. It feels rough to the touch, and is matte, living up to it's concrete name.
The effect is quite similar to the leather look polish, so I wouldn't recommend buying both.
The concrete polish retails at £12 from Nails Inc retailers. Not a cheap polish, but I do like the effect.