How to Burnish & Sleek Leather Welts, Heels and Soles
Burnishing and sleeking are traditional finishing techniques used to compress, smooth and seal the raw leather edges of welts, heels and soles. A well-burnished shoe has tight, polished edges that resist moisture, hold their shape and give the finished shoe a professional, premium appearance. These techniques have been used by English shoemakers for centuries and remain the mark of quality handmade footwear.
What You'll Need
- Wooden burnishing tool (smooth rounded end)
- Wooden sleeking tool (flat angled edge)
- Beeswax or gum tragacanth (optional — for a higher polish)
- Lasted shoe on a last or shoe form
- Fine sandpaper (120 grit) for preparation
Understanding the Tools
- Burnishing tool — used to compress and smooth the welt and sole edge with firm, repeated strokes along the leather grain
- Sleeking tool — used at an angle against stacked heel layers to press and bond them together, creating a tight, seamless finish
- Both tools work by friction and pressure — no chemicals required for a basic finish
Step-by-Step Guide
Step 1 — Prepare the Edges
Lightly sand the welt, heel and sole edges with 120 grit sandpaper to remove any roughness and open the leather fibres. Wipe away dust with a clean cloth. For a higher polish, apply a thin coat of beeswax or gum tragacanth to the edge before burnishing.
Step 2 — Burnish the Welt
Press the rounded end of the burnishing tool firmly along the welt edge. Work in one direction with long, firm strokes, applying consistent pressure. Repeat until the surface is smooth and compressed.
Step 3 — Burnish the Sole Edge
Apply the same technique to the sole edge, working around the full perimeter of the shoe. The friction generated by the tool heats the leather fibres slightly, helping them compress and seal together.
Step 4 — Sleek the Heel
Hold the sleeking tool at approximately 45 degrees against the stacked heel layers. Apply firm downward pressure and work around the heel in short, overlapping strokes. This bonds the layers together and creates a clean, tight edge.
Step 5 — Final Polish
Once burnished, buff the edges with a clean cloth using brisk back-and-forth strokes to bring up a natural sheen. For a higher gloss, apply a second coat of beeswax and repeat the burnishing process.
Tips from the Workshop
- Always burnish in one direction — back-and-forth strokes can roughen the fibres rather than compress them
- Dampening the edge very slightly with water before burnishing helps the fibres compress more easily on vegetable-tanned leather
- The more passes you make with the tool, the tighter and more polished the finish
- Copper-tipped burnishing tools can be used with heat for an even higher polish on sole edges