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Harry Bloomfield

explained :
However, if you cut galv you expose bare steel, and rusting will begin
as soon as it rains.

I understand the galv to some extent migrates to cover the cut edges
[1], besides which the rusting will make very slow progress.

The effect is suggested to be better if the edge has been cut with a
shearing action (tin snips) rather than the tearing action of a drill.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk