When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
yes, it will only defrost where the element wires are. eventually the warmth will spread from the wires (as well as interior heat) and defrost the remainder of the rear window.
Tint wont slow it because the tint is on the inside and the wire is in the middle of the glass. I have noticed that around 0 degrees it takes a while. You have to get the whole car warm at that point.