Quote Originally Posted by Turbodude06
DO NOT SAND YOUR BACK GLASS!!!!!!!!!!! When u put the tint on their its going to magnify those scratchs the tint will go over the defroster lines, just fine .......

Always worked for me, my tint guy told me to do it, and he never has any issues doing so. If it scratches your bearing down too hard or using too rough of paper. You just barely run it accross to smooth it down enough where you wont have any issues.