I also use RC56 glue. Depending on the application, I also use mechanical attachment in addition to the glue. For side panel windows that do not lend themselves well to screws, I puncture several pinholes through the covering where the clear plastic will attach to the plane, roughen the edge of the clear plastic with 200 or 320 grit paper, and glue on with RC-56. For bubble canopies, I like to use the glue supplemented by four small screws- one in each corner. For open canopies, like you are asking about, you can use one screw on each end to anchor it as suggested above, or use stick pins spaced evenly along the whole mating edge. I built a PT-19 1/4 scale and used the pins with RC-56 and it came out looking just like rivits, quite nice. I taped the canopy in place, then using a small number drill to match diameter of the pin, drilled holes evenly spaced along the mating surface through both windscreen and balsa. I then glued the edge with RC-56, and cut off the pins to about 1/4" long with a heavy cutter (vise-grip) since they are quite hard. Push the shortened pins through the holes, and allow to dry while holding the edges down with masking tape. If you go to a fabric store, you can find a wide variety of pin sizes to get the correct scale size pin head.

Should you chose to use a CA glue instead of RC-56, make sure to use the fumeless type (more expensive) as regular CA will fog the clear canopy as it cures.

Pilgrim