Aircraft weathering techniques....

cferrero wrote:

The other is the pastel chalk technique. How do you get that to stick without blowing it off if you dullcoat/glosscoat it?

There are several things that come to mind when using pastels:

1. Apply pastels to flat finishes.  They really don't stick well to gloss coats.
2. If possible, grind them into the surface.  I use Q-tips for this.
3. Since some of the pastel effects will be lost during the sealing coat, you usually have to over-do it a bit with the understanding that the sealing coat will tone down the effect.
4. Pastels are really effective when using dark pastels over lighter paint, and rather ineffective when using light pastels over dark paint.  In the latter situation, any effects will be almost entirely lost with a sealing coat.
5. When applying the flat sealer coat, a light fog from a distance, particularly as you initially start to spray the sealing coat will help the air brush from simply blowing the stuff off.

cferrero wrote:

Also, without an airbrush (gasp, I know, I need to get one), what kinds of techniques can I use to highlite the panel lines prior to giving it a coat of light gray or white? Permanent black ink?

You can let your wash flow into the panel lines so the show up without being overdone.  And if your preference is a stronger look, use a blacker wash.  Another look that has gotten very popular is to neatly airbrush around the panel lines.  Although I think that it more showcases one's skill with an airbrush than any sort of weathering effect, you can achieve the same sort of an effect by using pastel chalk and a Q-tip.

I prefer oil brown/black myself. As to the wash attacking the underlayer, it seems you are not letting the future coat enough time to dry? If its washing off the paint, are you using dissimilar paint & wash media. Here's my sequence

primer, paint (acrylic usually), future, oil wash, flat coat or future again depending on whether I want a flat or glossy finish.

The multiple coats is to ensure you are keeping the 'shininess' the same on the whole model at each step.

Should work with everything but auto finishes.