I used standard polycarbonate on my car, been there close to 20 years now and has been thru he.. and back, going to replace it when I refinish the paint and will use the std. stuff again, as stated before, if you wash the grit and dirt off first and use a soft cloth when you clean it, then it will last longer,,I also use lemon pledge which helps hide small scratches.

Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.