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1. am i supposed to do the drybrush first or pastels?
Pastels in my opinion are the last bit of weathering after everything including dullcoteing. Although sometimes I use pastels mixed in with washes in weathering.
See this link Click on "tips and tricks", then "AFV weathering using washes, pastels & drybrushing".
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2. am i supposed to use just dry sanded pastels or should i mix them with some water? (i think mixing with water could ruin my oil wash?)
No ... you can use both. If your oil paint is properly dried, water wont effect it. Dry and wet pastels give different effects .. look to another recent thread where this was asked about.
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3. Should i use bare metal color (as in airplanes) for drybrush or Light grey as i read in most of articles?
I personally use some bare metal colours for edges ... but avoid bright silver. Gives a metallic look to the the plastic. But bare metal wont stay like this long before rusting in a wet environment. Rusty scratches can be used as well.
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4. Can i add another coat of matt after the pastel chalks? (NOTICE! I dotn have an airbrush, all painting and coating is bu brushes)
you dont need matt after pastels as they are very matt anyway ... to seal will lose alot of the pastel work. Brushing sealer ... I would think ... would lose all pastel work. Maybe some sort of spray sealer or fixative might work if it is misted on from a distance and lightly. Better to make sure it is not handled and kept free from dust in any case,,,, in a glassed in shelf if possible.
These are my opinions only. Other modellers may have a lot more experience of this than me. Other modellers might have different methods as well. Practice and experimenting is the best thing for pastels.