Hi there,
Ross (Triarius) pretty much has Tamiya acrylics covered in the following recent threads:
Tamiya Acrylics vs. MM Acrylics ???
Tinning Tamiya acrylics! (Should be "Thinning", but the title was taken directly from the thread "as is" )
There are many other threads regarding the use of Tamiya acrylics.
One thing which is very important to note: If you have picked up a bottle of Tamiya "Flat Base" (X-21), be aware that this is not a flat coat. It's not actually paint - rather, it's a flattening agent which is intended to be added to a gloss colour to make it "flat". Many people make the mistake of thinking it's a flat coat and simply thin it and spray. This usually results in a model covered in sticky translucent white goo. It can be mixed with Tamiya Clear Gloss (X-20) (or Future) at approximately 4 parts gloss to 1 part flat base to make a clear flat cloat.