How to use salt spray data in real environments?
I have to agree with Klaus.  ASTM B117 is, at best, a QC procedure.  In my experience, most corrosion and coatings scientist who use B117 do so because it is very well established, but it does not correlate to a real-world measure of performance.  ASTM D5894 is a better cabinet test and there is also an SAE procedure developed for automobiles.