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I use strops all the time to hone our many carving knives, our plane, and chisel blades, not to mention my pocket knife. Strops maintain our edges and gift them with pinnacle sharpness that lasts a long time. If you haven’t accidentally damaged your edge and need to use a more aggressive method of removing steel, then stropping can be that routing touch-up method which is fast and effortless to bring the edge back to 100% sharpness.
Carvers love their strops, and carvers who use basswood hardly ever need to call up the big sharpening guns, such as diamond or oil stones, as the strop is a very effective honing media.
So what is a strop? A strop is a piece of leather (or artificial leather) that is charged with fine honing media. The relative softness of the leather (compared to a stone) and the micro-fine size of the abrasive that is suspended in the honing media (wax or paste) provide us with a very smooth working and forgiving honing tool. While many like to have the strop affixed to a piece of hardwood or plywood, others just use it as is.
In this and the coming entries, I will review a few available stropping options, I will talk about the leather used in stropping, the compound I like, and show how to make one from scratch.
Among the commercially available strops, the Ukrainian BeaverCraft ash and leather strop is the one that I find myself using all the time. Both faces of this hefty ash pedal-looking strop are covered with black leather of medium softness. The strop arrives with a green honing compound stick which needs to be rubbed over and into the leather. To my younger student who ask about the strange-looking green stick, I say that the honing compound is like a crayon/chalk: a waxy stick that fine powdery minerals were mixed into it. The minerals are harder than the knife’s steel so once you pass its edge on the compound you abrade the steel. The finer the size of minerals, the smoother is the steel surface the strop leaves behind.
Strops come in a variety of surfaces, from hard and shiny, to textured-course and to smoother suede. The Black BeaverCraft pedal strop is somewhat in between as it is a smooth surface that has a gentle give to it.
The most common color for strop compounds is green, but not all green compounds are the same – not in terms of overall resilience nor in their mineral content. The cube compound that came with the inexpensive $9 strop is just too waxy. The green stick that came with the BeaverCraft is quite decent, and the big and green stick that LeeValley sells is one of the best. This last stick has just the right amount of wax to cover the suede surface without flaking off as other compounds might do, plus it stays put for a long time.
This paste compound (image below) is the best stropping media that I have tried. I believe that the compound is comprised of mineral oil and abrading particles, and thus it will probably never evaporate from the leather, flack, or dry. In addition, the paste moistens and conditions the leather and provides a sustainable and homogenous honing surface. The result is a reliable surface cover that sticks to the leather and also lubricates the stropping action. On that note, many carvers condition their strop with pure mineral oil and only then rub the stick compound on it. I guess that this method is on par with the paste compound that we use.
Next time I will show two more stropping options and explain how to build one out of scratch.
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