wel tinting isn't the easiest thing to do but once you learn it's not to hard at all. the big thing is cutting the tint and laying it on the outside of the windows to cut it to fit. Once the tint has been cut to fit the windo you have to remove the clar film from the sticky side of the tint. Once the clear is removed you then place the tint on the inside of the windows and begin to squeege out the air bubbles and all.
Now one thing I haven;t mentioned is to have soapy water on hand in a sprayer or squirt bottle. this will be used to spray on the tint when you remove the clear to spray the glue side of the tint to help you to be able to move it once placed inside the car and also you wouls spray the inside of the window as well.
I used a squeege to get out all of the bigger bubbles from the window then a hard card or license wrapped in a later of paper towes to work out the rest of the smaller bubbles.
there are a few steps that are involvd in doing it but if you want to learn then go for it otherwise leave it to a shop that knows how to and it might save you a little headache and some $ that you spend on the Gila tint from pepboys/super trac etc....
As for the 5%,20% 35% it all about the amount of light it's letting through. 5% only lets 5% light through..20% only lets through 20% and so on.
I do hope this migh thelp you out a bit and answer a few ?'s for you....
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