Estes Semi-Scale Saturn V, Kit #K-39, Part 7, Cutting Out The Fins

The fin pattern is taped down, face up on the cutting board.

The clear fin material is taped on top.

Using a straightedge and sharp knife - 

Cut and score the clear material about 1/2 the way through.

Flex the material back and forth at the cut lines. The cut line should crack.

I used small, smooth faced pliers on some lines that weren't wide enough to grasp with my fingers.

Run a sanding block over the edges to clean and square them up.