Those suggestions are all very good I am sure even though I have never tried them. I model probably 50% of the cars I build in suede finishes. I came across this method by accident when I first began using an airbrush. I find the proper look is achieved with a flat black base, or which ever color you desire. I spray from a bit further away and use higher air pressure than normal, 25-30 p.s.i. I try to achieve a finish that makes the model look dusty. And I mean dusty, it should look like it has been sitting on a shelf for a year, only the dust will be the color desired for the car. The model should look like it has dry paint overspray on it. Then take super fine sandpaper and sand the entire model. I don't know which grit to use, but Testors makes a sandpaper assortment pack and the 2 finest grits work great, the red and the tan papers, I believe. This makes a finish which is to the eye is clearly flat but there is a hint of shine on the curves of the model, just like a real suede paint job. It also acentuates panel lines because some of the darker paint "dust" is left in small recesses, similar to a wash. It makes for a great finish unless it is on an FA-18 Hornet, which is where I first discovered this method. Happy modeling.