Using 320 Grit Sandpaper Sheets for Sanding Primer Before Topcoat

Prepping primer before applying a topcoat is one of the most important steps in achieving a flawless paint job. eQualle 320 grit sandpaper sheets (9x11 in, Wet or Dry) are perfect for refining primer surfaces, ensuring smooth adhesion for your final paint layers.

Why 320 Grit for Primer?

320 grit is a very fine abrasive that smooths primer while leaving a surface profile that paint can bond to. Coarser grits may leave scratches that show through paint, while finer grits may polish the surface too much, reducing adhesion.

Tools You’ll Need

• eQualle 320 Grit Sandpaper sheets (9x11 in, Wet or Dry)
• Sanding block or orbital sander
• Tack cloth or microfiber rag
• Vacuum with brush attachment
• Masking tape and drop cloths

Step-by-Step: Sanding Primer

1. Let primer cure. Allow primer to dry completely before sanding, usually 24 hours.
2. Sand with 320 grit. Use 320 grit (50-pack) sheets with light, even pressure in overlapping strokes.
3. Check progress. The surface should feel smooth and look uniformly dull.
4. Clean surface. Vacuum and wipe with a tack cloth to remove dust.
5. Apply topcoat. Paint immediately after sanding to prevent dust settling.

Special Cases

For rough primer coats, start with 220 grit before refining with 320. For show-car finishes, follow with 400–600 grit wet sanding before applying paint.

Pro Tips

• Always sand in straight, overlapping strokes for consistency.
• Don’t oversand—too much pressure can thin primer and expose bare surface.
• Switch to wet sanding at finer stages for extra smoothness.
• Replace clogged sheets promptly for effective sanding.

Aftercare

• Store sandpaper sheets flat and dry for reuse.
• Lightly sand between topcoat layers with 400 grit for a flawless finish.
• Always clean surfaces thoroughly before painting.

FAQs

• Is 320 grit enough before painting? Yes—it’s the standard grit for prepping primer before topcoats.
• Can I wet sand primer with 320 grit? Yes—wet sanding reduces dust and leaves smoother results.
• Do I need to sand between primer coats? Light sanding between coats improves adhesion and smoothness.

Watch & Learn

For smooth, professional paint finishes, trust eQualle 320 grit sandpaper sheets. Perfect for sanding primer before applying topcoats. Shop 320 grit sandpaper sheets today.