Safebet,
Don't worry about smearing canopy glue. It's impossible to mess the job up. Have a damp paper towel ready. Make sure you run a bead of glue that is slightly too much glue. You want it to squeeze out. When it does, wipe it off with the damp towel. Tape the canopy in place and let the glue cure overnight.

It'll stay white looking for awhile, where it is thick. Don't worry about that either. It dries as clear as the canopy.

After you've got it taped, check after 10-15 minutes and wipe any more that might have squeezed out. The wet paper towel and the glue won't hurt anything. The glue wipes up great.

It's excellent stuff.