There are many reasons you might want to paint on a canvas panel instead of a stretched canvas. It's a straightforward process to make your own custom canvas panels and you can make a stack in an afternoon.
Making a Canvas Painting Panel - Jackson's Art Blog
Art Technique Archives - Page 6 of 102 - Jackson's Art Blog
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Making a Canvas Painting Panel - Jackson's Art Blog
Ellie Pennick: Jackson's Painting Prize 2023 Expert Judge Interview - Jackson's Art Blog
How to Prep Wood Panels for Oil Painting — Art by Natalie Williamson