Does t-molding shrink over time?

Thanks for all the feedback.
In the end I found a different solution. The main area that was detached was the curved front. I detached the front part of the t-molding fully from top to bottom. Then put it back in starting from the top and bending where needed to follow the contour of the cab correctly. Everything worked fine; of course now the t-molding does not cover the cab side fully to the bottom; about 1 cm is missing but being at the base of the cab no one will notice ;-)
 
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