I have strops laying around all over my shop; different sizes and shapes, large/small, flat, round, V-shaped, whatever shape is required for the tool at hand. They are an absolute necessity for carving tools. I will post a pic of my various strops if you wish.
I have used all manner of stropping compounds, from
emery, to
rouge, to
zam, to the ubiquitous "
green" chromium oxide compounds, to the
white compounds for stainless steel. They all seem to work well. Some require more stropping than others to get an edge.
Perhaps that is simply a measure of how little I know about this topic, or how unsophisticated I am. Frankly (some may consider it
crude), but I think I like emery and rouge best. They seem to cut fast, and leaves a good, sharp edge.
I have made strops from vegetable-tan
cowhide leather (probably best), but oil-tan leather is also very good. You can use the smooth or rough side, or make both to see which you prefer. There are arguments for the use of both. The leather need not be too thick; I have found 4-8 ounce leather best. Some seem to prefer thinner, and thinner is easier to form around curves when making a strop that is other than flat.
In my personal experience, I have found that pig-lamb-goatskin leathers do
not work as well.
I will close in saying that stropping has
totally transformed my woodworking and sharpening.
Stropping allows you to get your tools sharp very
quickly, and keep them sharp during use. You can delay going back to the sharpening stone for a very long time, and your tools will be more sharp during use as well.
Although I sharpen my plane irons and chisels to 8,000 grit when I require a
very sharp edge, more often than not I have lately gone directly from a 1,000 grit diamond stone to the strop and back to working wood. That seems to be adequate for most applications.
I am sure there are many on this site that have good advice on this topic...
Best wishes...