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I'll cut a sample strip for the welt and try the belt sander.
I have never tried to sand the leather for the welting,
As I have a steam iron, I just steamed the leather on the reverse and the made the welting.
When the leather is warm, one can easily work with it. After cooling down, it really is a nice tight fit around the welt.
At present I work on a Fritz Hansen Chair on a re-upholstery job. Use the double welt on the edge to cover up the staples.
But in this case I just soak the leather, sew it in wet condition and apply it around the chair. As the Leather tries it shrinks and is a tight fit on the edges.