If you’ve ever admired the smooth, glossy edges on a leather card holder and wondered how they’re made, this guide is for you. Burnishing is the process of polishing raw leather edges so they’re smooth, sealed, and comfortable to hold. It’s a simple, satisfying step you can do at home to refresh your Theo Leathercraft card holder or any other vegetable tanned leather piece.
What is burnishing?
When leather is cut, the edges are left open and fibrous. Over time, those fibres can fluff, catch, or feel a little rough. Burnishing compresses and polishes those fibres with friction and a bit of moisture or wax, creating a sleek edge that feels as good as it looks.
On our card holders, each edge is already sanded, burnished, and finished by hand at our workbench in Auckland. With regular use, you might see some light fuzz return on high‑wear areas – burnishing lets you tidy that up and keep your piece looking sharp.
Tools and materials you’ll need
You don’t need a full leather workshop to burnish at home. A few simple tools are enough:
- Pieces of sandpaper (150, 220, 380, 400 and 800 grit)
- Edge burnishing solution (water and / or tokonole)
- A small piece of canvas or another scrap of cotton cloth
Step 1: Clean the edge
Before you start, wipe down your card holder with a dry cloth to remove dust or surface dirt. Focus on the edges – you want them clean and dry so the fibres respond well to burnishing.
If your card holder is damp from rain or recent conditioning, let it dry completely first.
Step 2: Start sanding with 150 grit
Start with 150 grit sandpaper to even out the edge.
Work on one side at a time, keeping your strokes going in a single direction and applying a small, steady amount of pressure. You’re aiming to level the edge and knock back any high spots, not to remove lots of leather.
Once the edge feels more even, lightly wet it with clean water. Using a piece of canvas or firm cotton, wipe and rub along the edge in one direction until it starts to feel slick and smooth to the touch.
Step 3: Refine with 220 grit (repeat with the finer grits)
Move up to 220 grit sandpaper and repeat the process.
Again, work in one direction along the edge. This time, focus on using quicker strokes rather than heavy pressure – the speed helps generate a little heat, which encourages the natural oils in the leather to fuse and tighten the fibres.
When the edge looks more uniform, lightly wet it again and use your canvas to burnish in one direction until it feels smooth and looks slightly satiny. You can repeat this light sand and burnish cycle if you want an even crisper finish before moving to finer grits.
Step 4: Finish with 800 grit and tokonole
After you’ve worked through to 800 grit and the edge feels even, it’s time to finish it.
Apply a small amount of tokonole along the edge and add a touch of water to help it spread. You want a thin, even layer rather than thick patches.
Using your canvas, burnish the edge in one direction with quick, firm strokes. As the friction builds up a little heat, the fibres will tighten and the tokonole will set, giving you an edge that looks shiny and feels smooth to the touch.
Step 5: Repeat if needed
If you still see a few fuzzy areas, repeat:
- Light sand on just that section.
- A touch of moisture or solution.
- Burnish again until smooth.
Vegetable tanned leathers like Minerva Box, Vacchetta, and Buttero respond well to patient, repeated passes rather than heavy pressure all at once.