I know many modellers use this method, and it's become something of a 'fad', but personally, I haven't seen any great benefit, even with light coloured finishes. I much prefer to give the model a proper 'top coat' then, if required, 'post shade', either by painting the edges of individual panels, or by lining in pencil and or the use of pastels or similar.
Each to their own of course, but pre-shading, I think, can be overdone sometimes, and ineffective at other times.