The best way for a flawless finish is to apply concealer after foundation as concealer and other products can be wiped off or smudged.
The Sun (2010)
For a flawless finish, go over with a deep red lipstick.
Times, Sunday Times (2009)
For a flawless finish, it is worth investing in a foundation brush.
Times, Sunday Times (2009)
Blend for a flawless finish.
Times, Sunday Times (2016)