Duplicolor DAP1699 General Purpose Primer Sealer Gray Primer Sealer 12 Oz. Aerosol | JB Tools
Rust-Oleum 249321 Auto Coatings Primer Sealer Gray Spray: Auto Primer Sprays (020066188641-1)
The Army Painter GameMaster Terrain Sealer Matt Sealer, 300 mL Water-Based Acrylic Spray Paint Primer, Doesn't Melt XPS Styrofoam, for Tabletop Roleplaying, Boardgames, Wargaming Terrain : Amazon.co.uk: DIY & Tools