Vallejo has just published a book titled "Airbrush and weathering techniques" with Rob Ferreira (Scratchmod). It is focused on the use of acrylic modelling products.

Vallejo brand is commonly associated to acrylic products, and for a good reason: they started the Model Color range long time ago, and since then they have added more and more products aimed to modellers, the majority of them acrylic.

Acrylic products have advantages like being water-soluble, non-toxic and having short drying times. However, sometimes these features require specific techniques for working with them.

The book from Rob Ferreira offers 204 pages in English with tips, tricks and techniques for using an airbrush and weathering armour models. It is profusely illustrated with lots of photos, which explain step-by-step all the processes.

From the few pages shown it looks quite comprehensive, including also tips on decals.