Why a Strop Deserves a Place on Your Bench

A freshly sharpened chisel or plane iron straight off a 1000-grit waterstone is sharp, but it is not yet at its best. Look closely at the edge under a bright light and you will usually see a fine wire edge, or burr, clinging to the tip. That burr feels sharp to the thumb but crumbles the moment the tool meets timber, leaving you with an edge that dulls within a few strokes. A strop removes that burr and polishes the bevel to a mirror finish, and it does so without removing any measurable amount of steel.

The good news for UK makers is that a strop is one of the cheapest tools you will ever make. A scrap of leather, a flat offcut of board and a smear of adhesive are all it takes. Half an hour at the bench and you will have a honing step that lasts for years.

Choosing Your Materials

Almost any flat, rigid board will do, but it must stay flat. An 18mm offcut of birch ply or MDF cut to roughly 300mm by 75mm makes a comfortable two-handed strop. If you want a double-sided version, go for 100mm wide so you can fit leather on both faces.

For the leather itself, aim for 3mm to 4mm of vegetable-tanned hide. Thin chrome-tanned leather stretches and dishes under pressure, so save the soft stuff for the workshop apron. You do not need to buy a whole side. Offcuts turn up regularly at craft shops, leather suppliers and upholsterers, and an old leather belt from a charity shop will yield two or three excellent strop pads once you cut away the worn holes.

• Board: 18mm birch ply or MDF, 300mm x 75mm
• Leather: 3mm to 4mm veg-tan offcut, about 250mm x 70mm
• Adhesive: contact adhesive or a good quality PVA
• Optional: a bar of chromium oxide or jeweller's rouge
• Tools: craft knife, steel rule, sandpaper, a weight or a few clamps

Building the Strop

Prepare the board first. Cut it slightly longer than the leather so you have bare timber to hold, and sand the edges and corners smooth. A rounded corner is kinder to your fingertips and saves your bench top from knocks.

Cut the leather oversize. Trim your pad about 5mm wider and longer than the finished size. Leather rarely cuts perfectly square, and leaving a margin means you can trim it flush after gluing rather than fighting an uneven edge.

Glue it down. Roughen the back of the leather lightly with coarse sandpaper so the adhesive has something to key into. Contact adhesive gives the flattest result: coat both surfaces, wait until they are tacky, then lay the leather down starting from one end and press outwards to push any trapped air ahead of you. Work from the middle outwards to either side as well. Roll or press the whole pad firmly, stack a few heavy books on top and leave it overnight.

Trim and finish. Once the glue has cured, run a sharp craft knife along the board edges to trim the leather flush. Chamfer the leather edges very slightly with a fine file so they do not catch the blade as you stroke.

Which side faces out? The rough flesh side is the traditional choice because it holds honing compound well and gives a slightly more aggressive cut. The smooth grain side produces the finest polish on a bare strop. If you build a double-sided board, put flesh side one way and grain the other, and you have both options in one tool.

Charging the Leather

A bare strop works, but a charged one works faster. Chromium oxide in a wax bar is the workshop standard: scribble a light film across the leather, then rub it in with the heel of your hand or a scrap of hardwood until the surface looks evenly grey rather than patchy.

Less is genuinely more here. A thick crust of compound does nothing except round over the very edge you are trying to refine. Recharge only when the leather starts to look bare, perhaps once every dozen or so sharpening sessions. Jeweller's rouge is a finer alternative for carving tools and knives where you want the keenest possible edge.

The Stropping Stroke

Get the technique right and the strop will keep an edge usable for weeks. Lay the bevel flat on the leather, then lift the handle just a degree or two so the edge is in contact without digging in. Draw the tool backwards, away from the cutting edge, with light pressure. Never push the edge forwards into the leather, or you will slice the surface and blunt the tool in one motion.

• Ten to twenty passes per side, alternating, for a chisel or plane iron
• Keep the angle consistent; a honing guide helps if you are learning
• Use barely any downward pressure, just the weight of your hand
• Finish with a few passes on bare leather to clean the edge

Test the result on the end grain of a scrap of pine. If the tool bites and leaves a clean, waxy shaving rather than white dust, the burr is gone and the edge is where it should be.

Care, Maintenance and Variations

Keep the strop flat and dry. Store it on a shelf rather than in a damp corner, because a swollen board will never sit true again. If the leather becomes clogged with grey swarf, scrape it lightly with the back of a knife blade or refresh the surface with a few strokes of fine sandpaper, then recharge it.

Once you have made one, the variations come quickly. A narrow 25mm strop glued to a length of hardwood is perfect for gouges and carving tools, since you can roll the edge around the curve. A paddle-shaped strop with a handle suits knives. Many makers keep three boards on the go, each charged with a progressively finer abrasive, and treat them as the final three grits in their sharpening sequence. It is a small investment of time for a lifetime of keener edges.