Question is did you buy the cheapies or the good seals?
Don't mess with the Mexican/Brazilian ones....they're junk. Buy the German made ones. Trust me I know. Same with window rubber.
That's right now that I think back on it they were tight at first. The doors would really pop open when you hit the handle. But, they settle in quite nicely.
I had the same problem with my new my German door seals. They were hard to close and were a weird grey colour. I made sure they were pushed all the way into the door and treated them with Protectorant 303 (like Armoral but better) and shut the doors tight. After a few days they were fine.
The German seals are tight, I doubt that a car as old as yours would be air tight but when the VW's were new, you needed to open the window a little to close the door tight.
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