Well, after 18 years of not touching a model I decided to start all over again.

Since then a few this are new in this area, paints, additives, pigments etc etc and ... the Internet (hurraaahh!!!)

I got myself a nice Tamiya 1:35 Bradley, a set of Eduard photo etched parts, CMK pigments, and of course the paints from Xtracrilycs (my modeller habits never die eh eh).

I used to do 1/72 planes and weathering was very light and minimal but at this scale things are a bit different.

About airbrushing I have no doubts and I still a hev my AB's (DeVilbiss Sprite and Iwata)

The weathering is the part I'm not used to at all.

I'm planning of painting a 1st coat of flatt black and then aplly the base color (US Sand) leaving the shadows produced by the underlying black.

Then what do I do? Apply pigments as dust or mixed with water?
Shoul I use them for some rust effects too, or should I use the dry brush method?

I've seen a Bradley (beautiful) and it seems that at the end a very fine layer of paint (higly dissolved) was sprayed over to give a general dusty effect.

Any advice from the experts (maybe you're all experts compared with me eh eh) would be great.
Sorry if I'm repeating a lot of questions that have been aswered before. I'm a total forum rookie

Here are a couple of thoughts I have
1st of all - don't feel like there is One way to apply weathering.

I usually do the following.
1. base coat,
2. finish coat (or coats if multi color)
3. Add all chips, rust (with paint), damage paint, drips, etc.
4. pin wash (small detail area of washes to pop out the details)
5. If I'm going to add a filter/overall wash I do it now. This is wash solution applied to the entire model to unify everything.
6. I apply pastels/powders as dusty dirty weathering.

I haven't used CMK powders so I can't address how to use them. I have used pastels a powder during step 6 or as a liquid/paste during step 3.