My tail spoiler’s got blisters and cracked paint!

So when I pulled in the flanks of my rear spoiler the day before yesterday I had noticed so funny white spots and thought that this would be birdish! But far missing under closer consideration I saw small bubbles and broken paint spots! http://people.freenet.de/megaturtel/vts/Lackfehler.jpg The white is the primer! The phenomenon can only be seen on the two external flanks! So I know of old GFK spoilers in the summer but hello we haves anno 2006!!!! Cu Meg