Good for 'drying' too
Not to be discounted is the effect of 'airflow' to both sides of the seam. I like the holes because it allows me to reach in with the ol' burnishing tool and press the seams from inside while supporting from the outside. Plus, I can often re-establish my pre-formed 'compound curvature' which tends to flatten out when applying the skin to the former (I know, that is "backwards" from the usual practice.)
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