## Do I need to shrink the automotive precut window tinting tint film?

#### August 23, 2019

If installing our window film on a flat or very slightly contour glass, it does not require heat shrinking. For example, rear windshield for trucks and many side windows on the SUVs, mini vans, and trucks.

If going on a contour glass, for example not all but many side windows for cars and almost all rear windshield for most types of vehicle except trucks, the film needs to be heat shrunk with a heat gun on the outside glass prior to installing it on the inside.

## Is 35% or 20% tint darker?

#### February 17, 2023

In United States, these percentage means visible light transmission (VLT).  A 35% VLT means 35% of visible light is transmitting through the glass whereas a 20% VLT means only 20% is passing through.  Therefore, the 20% VLT tint is darker.

## Window tint percentage calculator

#### February 17, 2023

If we use a factory tint at 20% VLT for example and want to add a 35% VLT tint on top, the equation is 35 x 20/100 =  7% VLT.

## Does factory tint block heat?

#### February 17, 2023

Most of the factory tint on the clear glass is roughly seventy percent visible light transmission (VLT) and rear factory tint on many trucks and SUVs is roughly at twenty percent VLT.  The heat and UV rejections on many factory tints are limited.  You can boost the performance of the factory tint without making them noticeably darker by adding a 70% virtually clear or 50% slightly tinted tint on top of the factory tint.  On the other hand if you like more privacy, you can choose to add a darker tint.  If you add a 35% tint on top of the factory 20% tint for example, it will end up at roughly 7%. The equation is 35 x 20/100 =  7% VLT.

## What percent is most factory tint?

#### February 17, 2023

Most of the factory tint on the clear glass is roughly seventy percent visible light transmission (VLT) and rear factory tint on many trucks and SUVs is roughly at twenty percent VLT.  The heat and UV rejections on many factory tints are limited.  You can boost the performance of the factory tint without making them noticeably darker by adding a 70% virtually clear or 50% slightly tinted tint on top of the factory tint.  On the other hand if you like more privacy, you can choose to add a darker tint.  If you add a 35% tint on top of the factory 20% tint for example, it will end up at roughly 7%. The equation is 35 x 20/100 =  7% VLT.

## How do you calculate tint percentage over factory tint?

#### February 17, 2023

If we use a factory tint at 20% VLT for example and want to add a 35% VLT tint on top, the equation is 35 x 20/100 =  7% VLT.

## Can you tint over a custom tint?

#### February 17, 2023

You can tint over custom tint.  Surface of the custom tint is more tacky versus glass. When mixing the application solution, please add more concentrated application solution or baby shampoo to the water.