For the past year I have been using Bio Sculpture Lavender Base.
A base/colour/top coat all in one that is great for dry brittle nails.
It has lovely lavender shade which looks so natural and makes the nails look fresh and healthy.
I tend to apply 3 coats as I like to see the colour a bit more and then sometimes I apply a clear coat on the top just for extra shine.
It stays on for a week or more and is easily removed with ordinary nail enamel remover.
Only available in salons that stock Bio Sculpture and of course on line.