I usually prefer Barry M for nail varnishes, but there was a good offer on the 17 range in Boots so I bought this matte top coat (along with a few other things!) a while ago, but only just got around to trying it.

It's a 10ml bottle, which is a standard size for nail varnishes. The colour looks like diluted milk in the bottle, but it goes on clear and doesn't change the colour of the nail varnish you're wearing it on top of. It does exactly what it says on the tin: as it dries, you can see your nail varnish turning from shiny to matte. It dries to the touch pretty quickly, within a minute.

The only thing I disliked about it is if you go over the same spot twice it will lift some colour off the bottom coat. This is especially problematic when you've given nail art a go: I ended up with a few smudged polka dots. It's important to get it on quickly and smoothly because it dries so quickly, otherwise it seems to highlight perfections more than a normal top coat would.

I think this is a really neat little product, and I'll buy more 17 nail varnishes in the future. It allows all colours in your nail varnish collection to do double duty, and looks especially good on top of nail art. My favourite look is bright yellow with white polka dots and the matte top coat, but if that's not your style, I liked it over a plain navy too.