Tinting over factory tinted glass

[TQtinting]

I apologize in advance for asking a noob question, but idk if I’ve ever seen it asked or answered. 

 

Example: if I put 15% on rear windows of an already factory done SUV, will it just be 15% or will that make it super dark?

 

I do know when it’s aftermarket if you cover 35% with 35% it technically makes it like 12% correct? 

[ErieTint]

20 minutes ago, TQtinting said:

I apologize in advance for asking a noob question, but idk if I’ve ever seen it asked or answered. 

 

Example: if I put 15% on rear windows of an already factory done SUV, will it just be 15% or will that make it super dark?

 

I do know when it’s aftermarket if you cover 35% with 35% it technically makes it like 12% correct? 

 

Its (almost) as simple as the math with this. Things aren't 100% accurate because, as we all know, our film and factory glass isn't 100% accurate either.

 

Most factory glass that is tinted is somewhere between 18% and 25% with a variance as high as +/- 5% depending on the manufacturer.

 

So if you take a piece of 18% factory glass and throw 50% over top, that will leave you around 9% installed. (18% x .50 = 9%)

 

Same example, if you take a piece of 18% factory glass and throw 15% over top that will leave you closer to 3% installed.

[TQtinting]

Ok, it took me a second but I think I get it now lol. Pretty simple way of figuring it out!

 

actually just found on old thread on this and did not understand it until you explained the math. 

Edited March 13, 2018 by TQtinting

[jh812]

Just keep in mind that formula is a guideline and not an exact representation. I checked it several times for legal on windows and it was never within 3%. I believe it is more accurate on the darker vlt but don't depend on it for "legal" 

[florida tinter]

I use a meter . they are a good investment 

[pbalentine]

Say custy wants limo on Newer silverado or ram, put 15% over 15% factory you get 5%.  Best combo imo on these is 35% rear, 15% front for the same darkness all around. If its lighter privacy like older toyota, which s around 25%-30%, then do 5%.  Ive just been eyeing it or putting a white piece of paper behind it to gauge it that way. 

[TINT]

Correction .15 x .15 is .02% 

 

  SHIAT IS DARK 

[drtint]

On 3/12/2018 at 9:49 PM, TQtinting said:

I apologize in advance for asking a noob question, but idk if I’ve ever seen it asked or answered. 

 

Example: if I put 15% on rear windows of an already factory done SUV, will it just be 15% or will that make it super dark?

 

I do know when it’s aftermarket if you cover 35% with 35% it technically makes it like 12% correct? 

No