If you heat the vinyl to 200 degrees after laying it down you don't need adhesion promoter. Heating it past 200 degrees will "set" the vinyl and the molecules will "reset" and take the shape of whatever it was stretched around.
Be careful with primer 94 (adhesion promoter), it ate through my cars clear coat. I'm sure it would eat through the trim clear as well.
As far as corners go, you make relief cuts. When you get to an edge, stretch it over the edge and make a relief cut 45 degrees to the corner. Watch some youtube videos. They should go over it.
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