Pre-shading works best, in my experince, with single-colour paint schemes (or, at least, single-colour undersurfaces and single-colour uppersurfaces):
I prefer an oil wash in the panel lines:
or highlighting the centres of panels with lighter versions of the base colour:
And occasionally, you can use both:
Sometimes, using pastels brushed backwards from panel lines can be effective:
and on larger models, spraying different panels in slighlty diferent shades can work:
Thing is, different methods work in different situations. You have to experiment, and fidn what works for you, and what you're comfortable with. Don't be afraid to experiment.:
but just don't over-do it:
With weathering, almost always, less is more!
Cheers,
Chris.
Cute and cuddly, boys, cute and cuddly!