Clean the Scratch:Wipe the damaged area with a clean damp cloth to remove face dust, dirt, grease, and other stains. If there are rust spots, gently sand them off with extremely fine wet sandpaper dipped in water, then wipe thoroughly to prevent the rust from spreading. Protect Surrounding Areas:Use masking tape to cover the area around the cratch to avoid accidentally applying paint to other parts during touch-ups. Shake the Pen Well:Shake the touch-up pen vigorously up and down for at least 30 times or 1–2 minutes to fully mix the paint evenly. First Application:Unscrew the cap, take out the paint pen, and scrape off excess paint on the bottle opening. Then align the tip with the damaged area and gently apply the paint, allowing it to flow evenly and cover the scratch. Apply a thin first coat. Multiple Layers:Wait 15 minutes for the paint to dry, then apply a second or third coat. Ensure each layer is thin and even until the painted area is slightly higher than the surrounding normal paint face. For deeper scratches, more layers may be needed until the face is level with the surrounding paint. Key points for using pearl white touch up paint pen: First, apply a thin layer of white primer, fill in the scratches, let them dry, and then lightly apply pearl topcoat. Attention: Dry each step thoroughly to avoid thick coating and sagging; Compare colors under natural light, and then use a clear varnish pen to polish wax to improve glossiness. The varnish pen is used last and applied to the outermost layer. It is a transparent, pigment-free coating, usually sprayed on the face of the colored paint, serving as a "protective layer" for the car's paintwork. It does not directly give the body color, but can form a hard transparent film with high transparency and gloss. After application, it can make the color of the colored paint more full and vivid, presenting a "mirror-like" reflective effect.