After watching some tutorial videos i needed to really secure the vinyl to the roof on both sides of the tape in order to get a clean cut.
How to vinyl wrap roof with sunroof.
I cut the vinyl as close to the knifeless tape edge as i was comfortable with.
Its simple to do easy.
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Then you can peel the line off the tape and slowly pull back at a 30 degree angle to the roof to start cutting the vinyl.
This video is a detailed how to on vinyl wrapping a shark fin antenna in one piece.