You want to use veg tanned leather - not chrome tanned. You can read about the various attributes of the different leathers - Kangaroo, Horse, Buffalo, Cow, ... etc and seems to mostly come down to the density of the leather and amount of natural silicates in them. Latter would not matter much if using compounds, pastes, diammond, ... etc. Cost and availability plays a factor as well.
I bought this leather and very happy with it but many other places you can get it from. I've had good luck in all respects with these folks several times now and recommend them. They also run sales regularly.
The Leather Guy -
The Leather Guy | Leather Hides, Scraps, Supplies & Hardware
Natural, 2-10 oz Veg Tan Pre-cuts, Artisan's Choice
Tooling Leather Veg Tan Pre-cuts | The Leather Guy
I bought 12x12 9 oz and then cut it into 4 3x12 strips and made 4 strops - 2 rough/suede side up and 2 smooth side up
Have recently bought some other weights to play with thinner cuts of leather but have not done it yet.
Glue the leather to the wood with Contact Cement that you can get anywhere (Home Depot, Lowes, Walmart, hardware store, ... etc.). I used DAP Weldwood but any should work fine.
Stropping Compounds (Bars)
- I use them on the rough/suede side of leather but have seen it used on both sides
- To remove/refresh I use a steel putty knife and basically scrape the old off by rubbing it back and forth in short strokes with putty knife perpendicular to strop. Works great. Have tried other methods like oils and stuff but not a fan.
- I prefer the white (Aluminum Oxide) but seems like most folks prefer the green (Chromium Oxide). I've got 1 strop with each. White is coarser than green.
- Have heard good things about and use Enkay brand compound. Also heard good about Formax and also heard that Formax supplies Enkay.
- There are a bunch out there and probably not much difference from one to the next but I went with the following Enkay compounds and very happy with them. Will last me a lifetime!
White Diamond Polishing Compound 4 oz. - SKU 152-W - $6.00
White Diamond Polishing Compound 4 oz.
$6.00
Green Stainless Steel Polishing Compound, 4 oz. - SKU 152-G - $6.00
Green Stainless Steel Polishing Compound, 4 oz.
I've recently been playing with Gunny Juice Diamond Suspension
- on smooth side of leather
- on plain basswood (no leather) purchased from Hobby Lobby
I've only used it once at this point so no real experience yet but seems good so far. Google is your friend and will find a number of YouTube videos regarding Gunny Juice.
For wood - I had some Red Oak pieces when I started making my own strops so I used that. Good, hard, flat pieces. I had 1x4 that I cut to just under 3 inches wide and just under 12 inches long (the size of my leather). That left a little extra room so the leather didn't have to be exact when I glued it on and then I just trimmed the edges after.
If you're using leather you just need the wood to be flat but if you're going to use paste or solutions (diamond, CBN, ... etc.) on plain wood you probably want to sand it a bit more than if just using leather - to get it flat and then some more to close up the grain.
I marked my wood with pencil and a cross hatch pattern and put my sandpaper on a piece of granite and then sanded on that to make sure the wood was flat.
There's a number of pastes out there but I don't have any first hand experience with them.
Hope this helps and good luck!