Porsche: car plastic wrap?

My dealer is offering to apply a 3M "plastic wrap" to my 997 before
delivery.

Is this a good idea? I live in a area where a lot of sand is applied to
roads, how long will this stuff last? Will it trap moisture the way a
standard auto bra does?

The only downside is that on certain areas like the hood you can clearly see
a line where the wrap is and where it isn't.


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