I actually found it pretty easy to line up by putting a corner down and putting a finger on it, so i could sorta pivot the mask around till it was right.. it can handle repeated removal (trial and error) but it wasnt that hard at all.
Good idea though chris, i'll have a play about with layering the masks and doing it that way, would be even easier.
I just noticed a lot of peoples window frames were either wonky or really wide (and wonky). This way you get a super consistent and clean line.
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