How to Sand Metal Railings Before Painting: Rust Removal and Smooth Finish Guide

Painting metal railings? Proper sanding is the difference between a smooth, durable finish and peeling paint. This step-by-step guide shows you how to remove rust, feather edges, and choose the right sandpaper grits for long-lasting results.

Why Sand Metal Railings Before Painting?

Sanding removes rust and old paint while creating a slightly rough surface that primer can grab. Skipping this step leads to early chipping and flaking.

Best Sandpaper Grits for Metal Railings

• 80–120 grit — stripping loose paint and heavy rust.
• 180–220 grit — smoothing and blending edges after rust removal.
• 320–400 grit — final pass before primer for a uniform surface.

Step-by-Step: How to Sand Metal Railings

1. Clean the railing with degreaser and let it dry.
2. Use 80–120 grit to remove rust and loose paint. Wire brushes help in tight spots.
3. Smooth transitions with 180–220 grit, feathering edges where old paint meets bare metal.
4. Finish with 320–400 grit to create an even, primer-ready surface.
5. Vacuum dust and wipe with a lint-free cloth before priming.

Pro Tips

• For intricate scrolls, fold sandpaper or use sanding sponges to reach curves.
• After sanding, apply a rust-inhibiting metal primer for best adhesion.
• Wet sanding (320–400 grit) can reduce dust before the final coat.

Watch & Learn

Shop metal sanding grits at eQualle and explore more sanding tutorials on our DIY blog.