As some of you may already know alot of BMW's as well as other cars have a problem with vertical scratches after getting their windows tinted. That's because of the weather stripping. Dirt and residue gets caught between the hard plastic part of the weather stripping and the glass which then scratches the tint. On E90's I noticed that the top part of the weather stripping has the felt already on it as seen in the photo below, but the bottom part of the weather stripping that you can not see is actually made of hard plastic which is the problem. What happens is after time, dirt and other crap falls down and gets wedged between the had plastic part of the weather stripping and the window which causes scratches when you roll the window up and down. What you need to do is install soft moleskin on the hard plastic.
You can remove the weather stripping and install the moleskin without removing the door panels. I know some people actually pull out the door panels but it is not necessary. Here's what you do. Just grab the top of the door panel on one side and pull it towards you.
The top of the door panel is held on by metal clips .
Once you have the top of the door panel fully loosened from the metal clip you want to grab the middle part of the weather stripping and pull up. If you have a hard time pulling up with your fingers you can use some pliers and grab it.
My car already has the felt on the bottom part of the weather stripping but some of you will have hard plastic on the bottom part of the weather stripping
This is the moleskin you can get from www.tintprotector.com
. It comes in a roll with adhesive on the backside of the moleskin to help it stick on the plastic part of weather stripping.
So what you want to do is measure the moleskin to make sure you cut off enough to cover the length of the weather stripping that you will be applying it to. Then trim the rest off. You will be applying the moleskin along the area of the weather stripping shown with the red line.
Now you need to peel off the white backing that covers the sticky part of the moleskin.
Now stick the moleskin on the plastic part of the weather stripping and it will now look something like this. In the picture I only stuck on a section of the moleskin since my weather stripping already has it.
After you are done installing the moleskin put the weather stripping back in by reverse procedure of how you took it out. I find it easier to put in by sticking one end of it into the top part of the window first then pushing it down and then pushing the rest of it down along the window. Hope this helps some people with installing moleskin without taking door panels off.