KWB

Why did the math to to figure out the tent you have to do the rear window is 20% and you're adding on 25% tint you would do 0.20 x 0.25 =0.05% I'm not sure what the rear stock tint is but I asked a person at a tinting place and they said stock windows are 20%, if so that would make my back window 5%, but it's more like 15%, so I don't know if that's true about the stock window but that's how you do the math

I have a 2006 Chevy Silverado 2500 I put 25% tint over the stock tint rear window and I believe it came out to look like the 15% tinted window