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Disadvantage of 3M kit is that it does not include the sealant, so headlights will haze again after a while. I would recommend buying some sealant or another kit which includes sealant. It will last much longer.
The answer to your question is relative. It depends on how much plastic you sand off each time, but I would not worry about that.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.