The formulation of the Revlon polish is very sheer so I would either do multiple coats (I ended up doing 3 coats), or layer this nail polish on top of a more opaque colour. I have previously layered Red Bikini by Revlon under this scented nail polish and the results still look the same. The MUA polish was very opaque and you could probably get away with doing 1 coat.
The Revlon scented polish only has a smell after it has completely dried. Watermelon Fizz as you probably have guessed has a fruity scent to it. The smell is not very strong and you can only smell it when you are very close to your nails. When you place a top coat over the scented parfume nail polish the smell disappears.