Vallejo Surface Primer German Panzer Grey (200ml 74603) is a large pot of dark gray primer polyurethane. This primer can be used directly or can be mixed with, for example, mediums or varnishes. The primer levels itself and dries matte and hard, with the saved details. Perfect for plastic, resin and metal and can easily be used in combination with Airbrush. Surface Primer can be cleaned easily with water. For stubborn dirt we recommend Airbrush Cleaner. 

Caution! Do not mix the Surface Primer, for example, alcohol or other solvents

For an interesting review on: http://taleofpainters.blogspot.nl/2012/02/review-vallejo-surface-primer.html