Technical Any tips for removing back window with REALLY old/hard rubber? (1941 Buick)

I'm removing all the gl*** from my '41 Buick because we're getting ready to chop it. I cracked the windshield trying to separate it from the very original and very hard rubber gasket. No biggie because it's flat gl***, but I don't want to do the same with the backlite. Any tips?
Thanks.
Curt

 

maybe some brake fluid , it destroys some rubber

 

Use a box cutter and cut the lip off of the rubber to expose the edge of the gl***. You will need to buy new rubber anyway so just cut the gl*** out.

 

^^^ Break out the knife, save yourself a lot of grief.

 

I cut the gl*** out of my 51 Chevy a few weeks ago. I just cut the old rubber down to the pinch weld and the gl*** all but fell out. The rubber moulding was hard and brittle but it did cut ok.

 

Squirt some penetrating oil or any oil on it and let it soak before cutting.

 

Utility knife, cut around perimeter on out side , sometimes the gl*** will still stick to the inside face , score that area with said knife and ...viola..now...putting it back in is another technique by itself consisting of rope , soap and ***istance of a dope....ha ha

 

i use a knife but tv shows use hammers. lol

 

when we would swop windows out of parts cars, to use the gl*** in the vehicle we would be saving. we would, break the gl*** to save the rubber on the project. cut the rubber on the donor to save the gl*** out of the parts vehicle.

 

I have removed a windshield from a 53 chev that had sat for years outside , I liberally loaded it with WD 40 and let it sit for just a few hours , damn thing slid out with very little effort .

 

...mite warm up the rubber with a butane torch very carefully, mite cut a lil easier

 

Or a heat gun.

 

heat gun and a knife is the way to go.

 

If the rubber is in any way pliable I use the box knife and a fresh blade, you want to swap out the blades often as the easiest way to get cut is to try to cut with a dull blade. If the rubber is really brittle I use a long-handed gasket s****er and a rubber mallet. You want to hit away from the center of the gl***, not towards the center of the gl***.

 

Thanks fellas. Worked like a charm. Took a while with two of us but the gl*** came out intact.

 

Great news there.

 

so which method did you use?

 

The box cutter is the only way to remove the gl***, the petrified rubber isn't reusable anyway. HRP

 

The Buick gl*** is installed from the inside, so there's a rubber molding that captures the trim and the pinch-welded seam on the outside and the gl*** on the inside. I sprayed PB blaster around the rubber the day before, then @Cody Walls and I cut the rubber (outside of the perimeter of the gl***) all the way around on the inside, then we slid a blade along the gl*** (running parallel to the gl***) on the outside to break the bond with the rubber. It released pretty easily after that. Then we cut the top off the car.

 

That was pretty drastic punishment for the car for not letting go of the rear gl***.

 

We don't take **** off anyone.

 

Make sure the gl*** can't fall inside and break when removing the rubber. I was not expecting that to happen.