Spray Primer Army Painter GM3004P 0.3 L – ready-mixed colouring primer for MDF, polystyrene, XPS

The Army Painter GM3004P 0.3 L spray primer is a ready-mixed colouring primer formulated for preparing MDF, polystyrene and extruded polystyrene (XPS) surfaces before painting. Supplied in a 0.3 litre aerosol can, this water-based primer provides an even, matt base layer that improves paint adhesion and colour coverage for model kits, miniatures and terrain scenery. The formulation is non-corrosive to common hobby materials, low in odour and designed to work with subsequent acrylic or water-based paint systems.

Advantages

This primer delivers consistent, even coverage in a single application and dries to a matt finish that enhances the visibility of subsequent paint layers. Its water-based composition reduces the risk of dissolving or warping delicate materials such as polystyrene and XPS foam. The ready-mixed aerosol format offers quick, uniform application to complex shapes and textured surfaces without the need for thinning or mixing.

Suitable for

• MDF sheets and panels used in scenery and basing
• Polystyrene model parts and kits
• Extruded polystyrene (XPS) foam terrain and scenic elements
• Hobby miniatures, dioramas and tabletop terrain pieces

Key specifications

• Volume: 0.3 litre aerosol can
• Finish: matt
• Base: water-based formulation
• Compatibility: safe for MDF, polystyrene and XPS foam
• Typical pack weight: approximately 354 g

How to use

Shake the can well before use. Ensure the workpiece is clean, dry and free of dust or grease. Hold the can at a distance of 20–30 cm from the surface and apply thin, even coats using sweeping motions. Allow each coat to dry before applying another; drying time will vary with temperature and humidity. For best results on textured or complex shapes, apply multiple light coats rather than a single heavy coat to avoid runs or pooling.

Usage recommendations

Use in a well-ventilated area and protect surrounding surfaces from overspray. Test the primer on a small scrap piece of the same material to confirm compatibility and appearance. After priming, allow adequate drying time before applying acrylic paints or weathering effects.