It's fiberglass. Thanks guys. I know it's not Utherane. That's why he doesn't know why it's cracking. Fiberglass is suppose to be pretty durable. But as long as it doesn't crack I'm happy.
Spoiler has been discontinued in 2001, it was then called ActionPackage Spoiler for 2002 and newer.
for the year 2000, had problems with cracking - adjustments were made and the problems were corrected.
check the TSB guides - you don't see people pulling these off their cars for recalls...
Is Toyota replacing these for you under warranty? if not - then why? something sounds fishy here...