Metallic primer contains aluminum or zinc particles that provide a reflective surface for paint to adhere to, enhancing durability and corrosion resistance. Non-metallic primer, on the other hand, lacks these particles, making it suitable for indoor applications where corrosion resistance is less critical.

The size of the nozzle determines the width and thickness of the spray pattern. Smaller nozzles produce narrow, precise lines, while larger nozzles create wider, heavier coats. For general-purpose applications, a medium-sized nozzle is often a good choice.

Yes, but proper ventilation and weather conditions are crucial. Choose a primer specifically designed for outdoor use, follow the manufacturer's instructions, and avoid spraying in direct sunlight or high winds.

Drying times vary depending on the product and environmental conditions. Typically, spray primer takes 30-60 minutes to dry to the touch, while spray paint requires 2-4 hours. Allow ample drying time before handling or applying additional coats.