Tim,once the lockstrip goes in it will help,your suggestion of the heat gun will help too but just go easy with the heat,yours don't look too bad
Claytonrite rubber,the type used in the rear windows is available in many different sizes,some of the wider profiles do tend to pucker in the corners and the small radius plays a part too.

Last edited by jockbolter50; 06/17/2019 1:29 PM.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.