Is it safe to install film over defroster wires on the back window of a car?
It is safe to apply film to windows with defroster lines, provided the lines are factory-installed. These lines are (1) completely imbedded in the glass, or (2) laminated by an amber or orange plastic coating on top of the glass. DO NOT apply film over painted-on defogger lines or the exposed silver-colored lines of aftermarket kits. Apply the film according to the step-by-step instruction sheet rolled up inside of the Gila Window Film you purchased. When you reach step 9, use the following procedure to ensure proper film adhesion on your defroster lines: Squeegee the film from the middle of the window toward each side. Then, starting at the top of the window, squeegee to the left and right from an “invisible” vertical line that you imagine bisects the height or your window. You will be squeegeeing parallel to (in the same direction as) the defroster lines to draw as much water as possible out from the left and right sides of the film. Use a soft, absorbent cloth or paper coffee filter
