The original windshield of my '63 Bug had some bubbling of the laminate material inside (as you can see in the pictures below), which looked really bad in my opinion. So I decided to replace it and to also install the chrome molding around it. I got all the replacement parts from my local VW parts supply shop, McNab Foreign Car. The job was pretty straight forward. I did watch a couple of how-to videos beforehand, which I've posted on my Volkswagen videos website.
The old windshield broke because I applied too much pressure while trying to removing it without cutting the old rubber seal, which was in pretty good shape so I wanted to see if I could save it for someone else that might need it. I ended up cutting it anyways and removed the windshield as usual. This was my second time doing this, the first time was on the '72 bug I used to have.
Putting the chrome trim into the rubber seal was really tough, I had to use some grease to make it easier for it to go in. I finally managed to finish before my hands and fingers were too tired.
Installing the windshield (or any of the windows) really requires two people to do it properly. One pulls on the string that goes inside the rubber seal, and the other gently taps down on the windshield to help it fit right into the frame.
Here are a few good videos on how to remove/replace the windshield and install the window chrome trim. A must see if you're doing these for the first time. Enjoy!