Ok guys you asked for it and here it is. I'm not much of a writer so if I don't explain it quite well, just ask a question. "WARNING" lots of pics here.
1 I started by giving the turret a base coat black/brown mix then added some Tamiya hull red to that mix
2 Next step is to wet the model with thinner, I use Mona Lisa paint thinner for oil paints. Apply oil paints, in this case black, van *** brown and yellow ochre. I applied more than the useual dot method for weathering. With a wet brush mix all the colors into the base color. It looks messy and smeared but that's ok.
3. Apply the rust colored pigments( I normally use real rust powder ) to the still wet surface. If the oils are drying too fast, simply wet it again. You want the pigments on thick, if it's too thick when done just simply use a soft brush and remove the pigments until your happy with the results. Use different shades of rust pigments starting from dark to light. You will notice the pigments start drying the thinner which is what you want.
4 The hair spray..I applied HS straight from the can only to the lower portion of the turret for this how-t. Before the HS dries I sprinkle salt over the HS. The HS helps the salt adhere better and quicker than water. A hair dryer speeds up the drying time.
5 Spray the appropriate tank color over the area you want the chipped paint to be, here only the lower portion of the turret.
6 Here is where my method differs from the normal HS/salt technique...No water to remove the salt/HS. I started by gently removing the salt with a large stiff brush. to remove more of the paint for large chips I switched to a short stiff brush. The pigments and oill paints form a barrier between the HS and base color so the paint comes off easy, revieling the rust area under neath.
7 to finish off the turret and give it dimension, I drybrushed black pastel powder over the lower section and raised surfaces.
And that's about all there is to it. It took me about 1 1/2 hours to do the turret. I hope this "how-to" is more helpful than the last not so clear post from above. Give it a try and let me know how it works out for you.
Feel free to ask questions if you have any.
Rob