You may not have used that Winslow much I am guessing? If it doesn't get sat it much, there is no pressure on the finish. Also, little soiling. The more you use them, the more you have to stay atop the maintenace.
Finished leathers (painted) stand up better to direct sunlight than any pure aniline, that's a given.
Duane Collie
Straight answers from thirty-six years in the business.
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