Sorry for the delay... I had to call the Auto Body shop that did the job for me.
Answer: SEM Adhesion Promoter AND SEM Vinyl Dye.
Google it. Available Amazon / Walmart. There are less expensive options than SEM which might make more sense for a fairly noncritical piece.
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My right rear window stopped working in the open down position. Local Ford service said it was the master control switch and ordered a replacement. Hopefully the repair job will be complete in three or four days.
I recently tossed a folded up moving pad behind the rear seat. Result: Immediate reduction in noise level ! Cheap , easy & quick improvement.
Iconic silver / XLT