400ml aerosol can of matte grey acrylic primer by Acrylicos Vallejo, suitable for both plastic and metal; it's a perfect base for almost any other color.
Vallejo - Mecha Surface Primer Grey (200ml) - Everything Airbrush
Vallejo 73615 Surface Primer USN Light Ghost Grey 60ml
VALLEJO 28.011 Aerosol Apprêt Gris Basic Grey Primer 400 ml.
VALLEJO - AEROSOL SURFACE PRIMER (GREY) 28011
Testing Vallejo Spray Paints - 9 Colors -
60 ml jar of matt grey acrylic primer by Ammo By Mig Jimenez (it's suited for brushes and airbrush, it's water-soluble, odorless, non-toxic and dries
AMMO BY MIG JIMENEZ - GREY PRIMER A.MIG 2002 60 ml
HGUC MS-06 ZAKU II MASS PRODUCTION TYPE 1/144
VALLEJO - AEROSOL SURFACE PRIMER (GREY) 28011
Real Grade gunpla of the Zeta Gundam from Mobile Suit Zeta Gundam show; it's a convertible snap-fit scale model kit by Bandai requiring assembly
RG MSZ-006 ZETA GUNDAM 1/144
MAZINGER Z WITH GOD SCRANDER - MODEL KIT