I was putting the window in The Coffin today. On the top and bottom, some of the tape squished out. On the sides, the flange is 3/4" and the tape is 1". All the edges needed to be trimmed.
I didn't want to use a sharp knife, like a utility knife, because that might mar the surface if I cut too deep. So I said to myself, "Self, what kind of knife doesn't cut very well?"
So I went into the kitchen and dug out a plastic table knife, the sort you get for picnics or take-out food.
It worked like a charm! Perfect cuts with no marring of the finish of the camper!
Just thought I'd share my discovery.
-eggsalad