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it looks like the actual bumper sticker is smaller so that it leaves a border of clear around it, the white you see is the backing put back on before trimming, the overlap will stick to the bumper, prolly easier to remove also since the area sticking to the car is only about a 1/2 inch all around.
it looks like the printed image is smaller, leaving a 'border' of laminate all around it, the white you see is the backing which is replaced before trimming the final stickers, you can see this in the photo where he is peeling the backing off (step 8) prolly easier to remove also since there is only about a 1/2 inch sticking to the bumper itself.
Looks like a fun project, I'd like to know what these actually sound like.
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