Hello Rowland,
It has to do with the strength of the bond. Even with scuff sanding the shear
forces
which get applied to the plate might be too strong. With the holes and the
redux inside them you are effectively interweaving the plate and the adhesive
which makes for a much stronger bond.
see http://europaowners.org/main.php?g2_itemId=86708
Regards, Jeroen
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Jeroen
http://www.europaowners.org/main.php?g2_itemId=44165
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=463099#463099
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