How to Sand Wooden Planters for Outdoor Refinishing (80–220 Grit)

Wooden planters are exposed to soil, water, and sunlight, which leads to weathering, rough surfaces, and peeling finishes. Sanding prepares planters for protective coatings, extending their lifespan and enhancing garden appeal.

Why Sand Planters?

Sanding removes rough fibers, old finishes, and discoloration. It ensures new coatings adhere properly, prevents splinters, and gives planters a refreshed, clean look.

Tools You’ll Need

• Sanding sponges for edges and corners
• Orbital sander for larger planter panels
• Wet/dry sandpaper sheets (80–220 grit)
• Vacuum or brush for dust removal
• Mask, goggles, gloves

Recommended Grit Sequence

• 80 grit: Removing heavy weathering and old finishes.
• 120 grit: Smoothing after coarse sanding.
• 180 grit: Preparing surfaces for stain or paint.
• 220 grit: Final sanding for smooth, touchable finishes.

Step-by-Step Process

1. Inspect the planter. Check for rot or loose joints and repair before sanding.
2. Start with 80 grit. Use 80 grit (25-pack) to strip rough wood and coatings.
3. Refine with 120 grit. Smooth panels using 120 grit (50-pack) wet/dry sheets.
4. Prep with 180 grit. Sand evenly with 180 grit (50-pack) before finishing.
5. Finish with 220 grit. Lightly sand edges and corners with 220 grit (100-pack) for smooth results.
6. Clean thoroughly. Brush or vacuum dust before finishing.
7. Apply finish. Use outdoor-rated stain, paint, or sealer to protect from moisture and soil.

Special Cases

For cedar or redwood planters, avoid sanding above 220 grit to maintain stain absorption. For painted planters, scuff sanding may be sufficient before repainting.

Pro Tips

• Sand with the grain for best results.
• Seal inside surfaces with waterproof liner or sealer for longer life.
• Use sanding sponges for tight corners and joints.
• Apply multiple thin coats of finish for maximum durability.

Aftercare

• Check planters seasonally for wear or peeling finishes.
• Reapply sealer every 1–2 years.
• Elevate planters off the ground to reduce water damage.

FAQs

• Do I need to sand to bare wood? Yes, if staining. For repainting, light sanding may be enough.
• Can I sand planters by hand? Yes—hand sanding is effective for corners and small planters.
• What grit is best before sealing? 180–220 grit ensures smoothness and good finish adhesion.

Watch & Learn

Sanding planters restores both beauty and durability. Stock up on coarse sheets, medium grits, and fine sandpapers to complete your next planter refinishing project.