Seeking advice regarding softening or stretching the rear quarter window gasket

Went to assemble the freshly painted rear-quarter window trim into the gasket and while it fit four years ago, it REALLY does not want to stretch enough to properly attach to the trim.

Anyone have any magic tips and tricks to soften that gasket and let it stretch out a bit so it can be re-used.

Soak it in something? Heat with heat gun or microwave?

?????

Thanks,

Larry

Original Post

LF-TP2511: Last August, I posted a very similar question regarding the problem I was having with putting the rubber around the quarter window glass. Eventually, I was able to put the rubber in very, very hot water to make it as pliable as possible, then stretch the rubber around the glass. I found that the stainless could be worked into the rubber groves first (just as the windshield does), then with an assortment of some hard plastic or hard rubber tools work the rubber around the glass to fit the glass into the rubber groves. I also used an inordinate amount of liquid detergent with the assembly. I might also add that the verbage and frustration level reached an all time high.   

 

 

Soak it in linseed oil, you will be amazed. Let it sit over night. You can buy that oil at any hardware store. The reason I know it works is because I tried it on my Mangusta rear glass rubbers. When I repainted the car I wanted the rear glass in the hatches removed. The rubbers were beyond hard, I had to be very careful not to crack the rubbers or crack the glass. The replacement rubbers on the goose do not work very well. I soaked the rubbers with a very heavy layer of the linseed oil. The next morning results were amazing. That was 5 years ago, they are still soft today.

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