I spent the better part of 15 years tinting homes and cars. The film you are refering to WILL improve the lbs per sq inch of your window but it will still break and the film will hold it in one place, also just a note the flim required to do this is VERY thick and may cause problems with rolling up and down your windows. Dont let some guy sell you Bull*** there is no tint that will stop a determined theif, money is better spent on a good alarm system.