Yes, contact adhesive can be used on metal. Contact adhesives are versatile bonding agents that work well with a variety of materials, including metal. They are particularly effective for applications where a strong, permanent bond is required. These adhesives are typically applied to both surfaces to be joined, allowed to dry until tacky, and then pressed together to form a bond. 
When using contact adhesive on metal, it is important to ensure that the metal surfaces are clean, dry, and free from any oils, rust, or debris to achieve optimal adhesion. Surface preparation might involve cleaning with a solvent or degreaser and possibly roughening the surface with sandpaper to enhance the adhesive's grip.
Contact adhesives are available in solvent-based and water-based formulations. Solvent-based adhesives generally offer stronger bonds and faster drying times, making them suitable for metal applications. However, they may emit strong fumes and require proper ventilation during use. Water-based adhesives are more environmentally friendly and have lower VOC emissions, but they may not be as strong or quick-drying as solvent-based options.
These adhesives are commonly used in metalworking, automotive, and construction industries for tasks such as bonding metal panels, laminates, and veneers. They provide excellent resistance to heat, moisture, and chemicals, making them suitable for both indoor and outdoor applications.
In summary, contact adhesive is a viable option for bonding metal, provided that the surfaces are properly prepared and the appropriate type of adhesive is selected for the specific application.