How do you match factory privacy glass on the front windows?
Short answer
There are two ways to match. A math match picks the film so the percentages combine to match the rear glass. A visual match picks the film that looks the same. They can differ because the front of the car gets extra light through the windshield, so a front window can look lighter even when the math matches. Washington's limit for front side windows is 24%.
Quick facts
| Package | Two to Match: the front two windows |
|---|---|
| Math match | Percentages combine to match the rear glass |
| Visual match | Film that looks the same as the rear glass |
| Front limit | At least 24% of visible light |
What is factory privacy glass?
Many SUVs, trucks and vans come with darker rear glass from the factory. The front side windows are usually clear, which leaves the car looking two-toned. Tinting the front two windows evens that out.
Why can a math match look lighter?
The front of the car gets extra light through the windshield. That light brightens the front of the cabin, so a front window can look lighter than the rear glass even when the numbers match.
Does the 24% rule still apply?
Yes. Washington law sets the limit for front side windows at 24% visible light transmission, whatever the match. See How dark can you legally tint your windows in Washington?
How APC Auto Spa does it
APC's Two to Match package tints the front two windows to match factory rear privacy glass, using Ceramic IR window tint.
APC talks through math and visual matching with you before install. See Window tint packages or APC's window tint page.
Frequently asked questions
- Will the front windows look exactly like the back?
- Often close, but not always. The front gets extra light through the windshield, so it can look a little lighter.
- How long does Two to Match take?
- Usually an hour or two. See How long does window tint take?
Reviewed by Heather Humphrey, co-owner of APC Auto Spa ยท Last updated October 2026
Heather leads customer education and training at APC's Tukwila and Monroe shops.