I agree with Biglg, I have never had a problem tinting on top of factory tint. Juat make sure you use a good brand and stay away from the dyed stuff. Llumar, 3M have been excellent in my experience. I am looking into Formulaone (CP Films who also makes Llumar) to possibly do the ceramic that will not interfere with radio signals and more importantly to me a little more heat rejection from the Hot FL sun.

 

I had my windows done at the same shop that has tinted my vehicles for years. He has always used Llumar tint. However, shockingly I get into my vehicle and there is a Suntek card in my Tahoe. I didnt ask anything about it. I have read online about it and it seems to be a high quality. I wonder how it compares to Llumar and the rest of the big names?

 

ONe other thing. I am not positive, but isnt factory tint usually IN the actual glass of the window, not on the inside?

 

I'm pretty sure that the factory tint is in the glass, not on it as a surface treatment.

 

Yes you guys are right. The glass is already tempered and has a 70% tint in it from the factory. The 70% tint is not a film on top of the window.