I used llumar for past 10 years and no problem at all.
My other car has the same tint for 6 years and no problem at all.
No matter what I tint the whole car because I want heat rejection. If you are going for just look then no ceramic is needed but since money is spent, better get good heat rejection.
If you don't tint the back, front side is somewhat stays cool when driving for long distance but then heat comes in from the back so your back of head gets hot haha
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