This is the best top coat I've ever used, I find that it stays on really well (usually 1-2 weeks) and makes my nails stay looking perfect for ages, some times I forget when I last did them!
It applies like any other top coat, I find it dries pretty quick in comparison with others and then leaves my nails so shiny.
I'll continue to use this all the time as my top coat now.
Sally Hansen Big Shiny Top Coat is Bae for me. First of it has a big fat brush so it covers more of you nail helping you give a nice even layer. Secondly even though this isn't a fast drying top coat it still dries fast, so you won't be feeling hopeless. Thirdly the finish of this to coat gives you a beautiful glossy finish as if you've used gel nail polish. The bottle is a little bigger then most top coats but the sliver packing gives it a edgy look.
Tips: A little goes a long way, it dries to a shinny finish, it can still look wet once it's dry.