Can I install window tint on a window with defroster lines?
Yes, you can install window tint on windows with defroster lines. Infact, it may make the defroster work a little better by allowing the small amount of heat generated by the defrosters distribute throughout the window more evenly.
You may also not a little distortion where the defroster lines are. That's because the film has to bend over the lines, causing minor visual distortion that does not affect overall visibility through the window.
The only thing to be careful about when tinting windows that have defroster lines is when cleaning the window prior to installing the film. You can't use a sharp blade to scrape the windows clean. You could accidently cut through one of the defroster lines, causing that line to no longer work.
Instead, you need to use a scrubbing pad (like the kind you scrub dirty dishes with) to scrub the window. Just be sure to thoroughly wash away any debri that may be left behind from the scrubbing pad before applying the window film.
Another caution with tinting window with defroster lines comes when/if the film needs to be removed from the window. Again, you can't use a sharp blade to scrape the film away with. Instead you'll want to use a mild chemical agent to disolve the adhesive or use steam to aid in the removal of the film.
http://www.northerntint.com/faq/show...ster+lines+:12