Weathering a tank

Welcome to the Forum. I think the best weathering technique is, after your've painted your tank and dry-brushed some highlights, use pastel chalk (scraped onto a palette with an Xacto blade) and then apply with a brush-good way to do rust or dust and even muzzle blackening. There are also pre-ground powders on the market. Then seal with dullcoat-you may have to repeat this process several times.

Welcome to the forum, Jenloong. You might want to post your query in the Armor forum for more responses.

For a beginner, pastel chalk can't be beat. I typically use a Q-tip to apply the ground pastels, sometimes really "scrubbing" it into the surface for a more pronounced effect. You will find that some of the effect goes away after sealing with dullcoat.

Another technique that is quite useful is the use of a wash, which is basically mostly thinner and just a bit of paint. You brush a dark colored wash over the surface, and it will collect around bolt heads, in corners, joints, etc, for a nice dirty look.

If you're new to model building, but handy with an airbrush, you can very lightly spray over the the tank with a dust colored paint, like Tamiya's Buff, to simulate the dust that collects. The idea is to go very light with the paint.

I usually apply an oil wash, then dry brush the tank with a grimy color mixed with oil paints, creat paint chips suing oil paints, spray select areas randomly with tamiya flat earth,give it a few different kinds of washes with humbrol earth enamels, add mud with mig pigments mud set and finally finish off with a coat of dust using my mig pigments. you might want to try something simpler for your first go however...