After sealing all four of my doors my car was still really wet inside. Water testing the car showed water was getting into the boot somewhere.

 

The rubber seal all around the boot was wet and the section of the boot panel with the locking mechanism was soaked, further inspection showed water was pouring in through the seal on the rear windscreen but it didn't look damaged.

 

Taking the rear screen out and re fitting it has solved solved my problem, a couple of tubs full of cat litter in the car and i can now drive it without it misting up!

How easy was it to take the rear screen out and bond back in place? And where did you get the screen sealer from?

Sorry should have said, i let auto glass do all the hard work for £110 quid. After months of smelling damp i now dont have a single drop of water in the boot, the only reason i got auto glass to do it was because they were replacing the front one at the same time.