Paint Effects Additive VALLEJO Vallejo Ammo Streaking Effects – Streaking Grime

VALLEJO Ammo Streaking Effects – Streaking Grime is a specialised acrylic-based weathering medium formulated to create vertical streaks, grime trails and realistic runoff on scale models, miniatures and dioramas. Designed for controlled application, the product is applied with a fine brush and can be softened or blended with an appropriate thinner to achieve subtle or pronounced streaking that mimics rain, oil, or accumulated dirt on vehicle hulls, building facades and other textured surfaces.

Advantages

This streaking medium offers consistent viscosity for predictable brush application and controlled flow, enabling precise placement of grime and streaks. It dries to a stable finish that can be adjusted before it sets, and is compatible with many acrylic paints and common modelling thinners and solvents when used as directed. The formulation allows for layering and varied intensity, supporting both delicate weathering effects and more pronounced runoff without damaging underlying paintwork when used correctly.

Suitable for

• Weathering vehicle exterior panels and armor plates
• Creating rain streaks and dirt trails on buildings and industrial structures
• Adding realism to diorama elements such as pipes, gutters and street surfaces
• Fine detail work on miniatures where controlled grime and staining is required

Key specifications

• Formulation: Acrylic-based weathering medium
• Application: Brush-applied for controlled streaking and flow
• Working method: Manipulated with thinner or thinner blends to adjust flow and intensity
• Finish: Dries to a stable, adjustable matte/semi-matte appearance depending on application
• Compatibility: Designed to work over acrylic paints and common modelling surfaces (plastic, resin, metal with appropriate priming)

How to use

Apply the product with a fine brush onto a prepared, dry surface where you want vertical streaks or grime. Use small dots or short strokes and then draw them downward to form streaks, or place dots and blend with a thinner to create trails. Adjust the width and intensity by varying brush size, amount applied and by thinning the product before or after application. Allow intermediate drying time between layers to build depth without disturbing earlier work. Clean tools with an appropriate solvent or cleaner after use.

Usage recommendations

Test the streaking medium on a scrap surface or an inconspicuous area before applying to the final model to determine the desired dilution and blending technique. Work in thin layers, allow drying between coats, and use compatible thinners and cleaners to avoid lifting base paint. Store the product upright in a cool, dry place and reseal the container after use.