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It means the weights have to be increased but it's a great upgrade in terms of cutting high pitched noise from the street.
I've only done a few because it pushes the price up a lot with extra lead and the more technical glass being expensive. You also can't use a normal putty as it can seep between the panes and discolour the laminate.
Airhead
bazschmaz
Noted for when we get around to the window stuff.