Sanding Plastic Models: Smooth Surfaces for Painting and Detailing

Plastic models—whether cars, airplanes, or miniatures—require smooth surfaces for paint and decals to adhere properly. Mold lines, seams, and surface imperfections can ruin the final look. Sanding with the right grit sequence ensures your models are clean, smooth, and ready for finishing touches.

Why Sand Plastic Models?

Sanding removes mold lines, evens seams, and creates a uniform surface for primer and paint. Without sanding, imperfections remain visible under coats of paint and decals may not adhere evenly.

Tools You’ll Need

• Wet/dry sandpaper sheets (400–2000 grit)
• Sanding sticks or needle files
• Foam sanding pads for curves
• Hobby knife (for trimming seams)
• Primer and paints
• Protective mask and magnifier (optional)

Recommended Grit Sequence

• 400 grit: Remove mold lines and seams.
• 800 grit: Smooth the surface for primer.
• 1500 grit: Refine scratches and prepare for paint.
• 2000 grit: Final polish for decals and clear coats.

Step-by-Step: Sanding Plastic Models

1. Inspect the model. Identify seams, flash, and imperfections.
2. Start with 400 grit. Use 400 grit (25-pack) wet/dry sheets to remove lines and rough spots.
3. Smooth with 800 grit. Switch to 800 grit (50-pack) for a refined surface.
4. Refine with 1500 grit. Use 1500 grit (100-pack) for prepping before paint.
5. Polish with 2000 grit. Wet sand gently to achieve a smooth base for decals and topcoats.
6. Prime and paint. Apply primer, then layer paint and finish as desired.

Special Cases

Clear plastic parts like canopies require extra care—start at 800 grit and progress to 2000 grit, then polish to restore clarity. Always sand gently to avoid scratching or clouding.

Pro Tips

• Always wet sand fine grits to prevent scratching plastic.
• Use foam-backed sandpaper for curved areas like airplane fuselages.
• Work slowly—removing too much plastic can ruin fine details.

Aftercare

• Apply a gloss coat before decals for smooth adhesion.
• Seal finished models with a clear coat for durability.
• Store models away from direct sunlight to prevent fading.

FAQs

• Can I dry sand models? Yes, but wet sanding is safer for fine grits.
• Do I need to sand before priming? Yes, sanding ensures primer adheres evenly.
• How do I avoid sanding away details? Use sanding sticks or fold small pieces of sandpaper for precision.

Watch & Learn

Sanding plastic models creates the perfect base for painting and detailing. Stock up on wet/dry sandpaper sheets—packs of 25, 50, and 100 available in all fine grits. Shop model sanding sheets here.