I'll add a how to strop in the last step, just in case.
Anyways, this instructable is mainly on how to load a strop, or to apply the compound. There are many different types of compound, such as diamond paste from DMT. I just use a green, chromium oxide compound from sears. Costed around $3. It's basically a block of craftsman polishing compound.
What you need:
Strop (piece of leather works best, although I have heard of jeans. And some people prefer balsa wood.)
Stove (really hope you have one... or just a campfire in the middle of the woods)
Compound (I got the one from sears. "Craftsman Green buffing compound")
Knives (If you don't, erm.. move on to another instructable. Or check out my other instructables to make a knife first!)
Paper Towel/Toilet Paper (Go to a fast food restaurant and borrow some if you have to)
Step 1: Clean the Strop
To clean the strop, I use ispropyl alcohol, and just rub down the strop and try to remove most of the things. Then, I use a 320 grit piece of sandpaper to both clean the strop, and also give the compound something to adhere to.
Step 2: Apply the Compound
For those with some kind of paste, like the DMT diamond ones, just put on a drop or so, and rub it in with your fingers.
Step 3: Rub It In
Heat up the stove top, and then heat up the piece of leather. Eventually, the compound will melt, much like a crayon, but at much lower temperatures. When it has melted, or looks kind of liquidy, or just softer, take the paper towel, and rub back and forth and rub the compound in. If the compound flakes and falls off, you probably did not heat enough. Repeat until you're satisfied with the amount of compound. I usually just have a thin coating.
Try not to get too close to the fire, but the leather might warp a little anyways. It's okay, a heavy book will press it back down. And regular use will flatten the strop again.
If you did it correctly, the surface of the leather should feel waxy and slippery. Like there's compound on it (duh!). Your finger shouldn't stick to it like normal leather, but glide over a surface. If it's a thin layer, you might not be able to see anything. If it's really thick, your leather might look like algae had some fun on it.
Step 4: Enjoy!
It's a pretty simple instructable, but I just put this out here because I love strops! They really help, especially when you're bad at sharpening. It won't make a dull knife sharp (well technically, given enough time, even water can sharpen a knife), but it can take that okay edge to a great one. This works because the leather has a bit of give, and will mold itself a bit to the knife's angle, as opposed to the unyielding stone.
Any questions, comments, concerns, please ask! Unless it's about animal cruelty. If you're that bothered, use a piece of balsa wood. Or jeans. Or even a piece of paper. I like leather for the give though.