Surface Primer: Grey (Vallejo)

Surface Primer is available in a range of basic shades that are most often used to prepare the surface of the model or miniature before starting the painting process. Primers can be applied to all surfaces, resin, PVC, brass, white metal or wood. The primer preserves even the smallest detail of a model and improves the adhesion of the colors applied to this base. It is recommended to apply the Primer in several layers; the product dries quickly and forms a homogeneous film of extraordinary strength and resistance within a few hours of application. 

Surface Primer can be used directly or diluted with Vallejo Airbrush Thinner or Flow Improver. 
You can apply Surface Primer with an airbrush or brush.
Recommended compressor settings are approximately 15-20 PSI or 0.5 to 1 kg. 
For best airbrush maintenance, it is recommended that you use Vallejo Airbrush Cleaner.
Surface Primer is non-flammable and contains no solvents.