Raised Panel Lines

acrylic paint or oil paints with appropriate thinner..
Here's a decent link: http://www.aircraftresourcecenter.com/TnT_Archives/Washes-weathering.htm

Here's how I do it:
http://www.craigcentral.com/models/wash.asp

Actually the same way. I recently did a 1/48 B-17E and accented the raised panel lines with a water soluble ink based sludge wash.

and here is a link to the build article ... http://www.swannysmodels.com/B17Ebuild.html