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Perth: long, dry, high-UV summers plus coastal salt
Perth combines a long high-UV summer with a coastal salt load across most of the metro area — the two conditions that shorten decal life most. Take the laminate. Beyond that, placement matters more here than elsewhere: a decal on a vertical door panel gets far less direct sun than one on a bonnet or a horizontal tray lid, and will visibly outlast it. Given freight distances to WA, ordering a slightly larger run than you need is usually cheaper than reordering.
