FC windshield gasket will not seat, length issue?

[TimeMachineParadox]

Hello all,
I've got a problem with my newly installed windshield gasket on my van. It's a deluxe gasket with stainless trim. I can not get it to seat the window all the way in, it's always slightly raised, particularily at the sides.

It's lubricated with glycerin and the initial install went great (albeit tedious). However when it came time to give the glass some slaps to get it to seat the rest of the way it went part way but not all the way.
I've poked and prodded the gasket everywhere thinking maybe it was hung up somewhere but still no dice. I've let it sit in the sun for a couple hours and tried to push it in the rest of the way, no dice.

I can push on the edge with the gasket and get the window to move and get close to where it should seat, but then it just pops back up. Obviously I don't want to push too hard for fear of cracking the glass.

It's an original windshield, so I doubt glass issues. I'm starting to think it might be a gasket length issue. This was a continuous length of gasket material I picked up relatively cheap a couple years ago, so I had to cut and bond it.

The parts book mentions that a std gasket should be 150" in developed length, while a deluxe gasket should be 173". The 3785254 deluxe gasket engineering drawing I got from Steve Spilatro also confirms this.

Not knowing all this at the time, I mocked up my gasket to my window opening and laid it around to get the length, making sure to tightly fit the gasket into the corners. I got about 150" of length (more like 152). I compared to my old gasket that I pulled out, it also measured about 150 -151".

The raw length of my new gasket was in the 150s. Since I didn't see how 173" would even fit, and my mockup and old gasket showed 150, I cut the new one to 150".
My final cut was very bad and so was the second on the third try it was good enough to bond mostly straight. I lost maybe 0.50" in length.

So, what do you reckon?
Did I end up with too short of a gasket for it to want to conform? And I should just bite the bullet and get a pre-made gasket now?
Do I let it sit in the sun for a couple more days and hope it wants to cooperate?
Or did I do something wrong and didn't get the glass positioned quite right?

[vairmech]

I just went through this last fall. There was a fellow that tried 3 glass companies and all said the gasket was too large. Guess what? It was a deluxe trim gasket, the trim fit and I got it installed! I really dislike the deluxe trim!

I don't know what the gasket length was but I'm pretty sure it came from Clark's. Visually it did look to very long but when you start placing it around the glass it actually fit pretty good.
The other thing you need to keep in mind is that the rubber will shrink over time, your bond will then split apart.