This tutorial might not be suitable for you, because you might not be able to buy the same edge burnishing liquid as mine. I got this from TAOBAO, a Chinese
How to: Easy Leather Edge Burnishing
Panda Handmade Leather
Leather Polishing Burnishing Machine, Leather Edge Grinding Kit Adjustable Rosewood Grinding Head Sander Buffing Motor for All Vegetable Tanned Leather 8000rpm 110V
Burnishing Leather Edges
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Toko Pro Burnishing Gum for Edges on Oil Tan and Veg Tan Leather, 500 Gram
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Bob Park Method of Burnishing & Edge Finishing
How-To Burnish Leather Edges #shorts
YaeKoo 0-8000RPM Leather Polisher Sander 350W Leather Burnishing Machine 110V Edge Grinding Machine with 6 Sanding Sleeves
How to get the BEST edge finish on vegetable tanned leather