The leather edge paint peeling consists in detaching the entire paint from the leather edge, which is removed as if it were a single piece of plastic. Depending on the cause of this issue you can change your leather edge preparation or use a basecoat with an adhesion aid to get your result.
How To Fix Faux Leather Peeling – Von Baer
Fiebing's Edge Kote (4oz) - Light Brown - Flexible, Water Resistant Surface Coating for Smoother Leather Edges - for Color Coating and Protecting Edges of Leather Shoes, Crafts and Furniture
How To Never Worry About A Leather Purse Peeling Again? - Marcello
Sealing Your Masking Tape for Better Hard Edges in Acrylic Painting - Jackson's Art Blog
Edge Coat Tips & Tricks; Part 2
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leather edge finishing paint leather edge paint leather edge paint roller diy leather edge paint tandy leather edge paint edger painter - Canvas Bag Leather Bag
My leather wallet is peeling/has peeled on the edges. Any recommendations on how to fix this? : r/Leathercraft
Finishing edges tutorial (With edge paint) - How Do I Do That?