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SRD, Hand America or Kremer pigments for powder. Most from other vendors come from Hand America or Kremer.

Look up old Kremer pigments, Chrome Oxide post for the order numbers from Kremer. You can...

You can also get nylon strapping from any fabric store for a couple bucks, canvas and especially Polyester canvas works great. A yard will make a bunch of strops.

For knives and tools paddles work...

For knives strop on a piece of MDF coated with 3 inch X’s of Chrome Oxide or any good metal polish.