If you do your nails regulary you will know the importance of a good top coat, firstly to imporve wear of your varish, secondly and perhaps most importantly to give the glossy, smooth salon finish you are after. In the past I have used most brands including pretty much every top coat Sally Hansen does but Seche Vite really is in a league of it's own. Best applied in my opinion whilst underneath varnish is still slightly tacky- it binds and fuses together the other layers of your polish- leaving an impenetrable cover. Perfect for applying over nail art- leaves the design looking amazing!
Also it makes your polish rock hard in under 3 minutes so you can literally do anything and not have chips and dents in your newly polished talons! This, for me is the biggest advantage of Seche Vite, cannot recommend highly enough.