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A friend of mine is painting a few mechs for a 28mm Mech Battle game we're running at the Little Wars convention this year. More on the whole project here...
http://www.dakkadakka.com/dakkaforum/posts/list/509520.page#5317533
... but we're specifically needing some help with the mechs right now. With an airbrush they've been basecoated, masked, then sprayed again, the results being thus.

I need a good method for lining the panel lines.

Micron pens?
Black Wash?

Help!!

Also any suggestions for very light weathering would be nice also.

Micro pens are the traditional manner of handling those for mecha modelers. Google should be able to provide plenty of examples.

You can also use brushes and inks (along with a little physics) to have the ink flow through the panel lines.

You can also smudge them. Seal the paint, and use a sponge loaded with oil paint. Rub it over the model, then wipe it off. The lines catch the paint, and it is a fast and dirty way to accent the panel lines.

I've had good luck using Micron pens. The ink has a bit of flow (sinks into even deep and narrow panel lines, with a few passes) and takes a few seconds to dry (can wipe any spillover from the surface), when not applied to an absorbent surface like paper, which makes them perfect for the task. At least, if you want a very stark effect. The ink is BLACK - intensely so, and without the reddish, almost metallic sheen that Sharpies can leave on smooth surfaces.

Pin washes are another option. After a coat of gloss varnish, solvent-based washes, especially, will hug corners tightly and flow to fill cracks with very little brushwork necessary. Look up some tutorial vids, as it seems almost magical, in action - touch a brush to one side of a hatch, then watch the blacklining magically spread.

One other option I've seen that Sean didn't mention is gouache. Being, essentially, the opaque version of watercolors, you can simply splodge it thickly into the recesses, then clean up the overflow with a damp cotton swab, even after allowing it to dry. Much faster drying than oils and doesn't necessitate the use of stinky (at best - caustic, at worst) solvents.