MEDIUM BLACK ABS CEMENT. This is the secret! My 5th Gen has an ABS fairing. The plastic is black. I found this ABS cement at Home Depot. I would not use Super Glue as mentioned above, I suggest the ABS Cement. They use ABS in plumbing pipes (Black plastic pipe).
For example my bike had fallen on its turn signal and cracked the ABS fairing. I put ABS cement in the the cracks and it really hardens up great. It actually has ground up ABS in it. You want to clean it up and get the outer surface as smooth as possible while its wet. This stuff hardens as strong as the fairing itself and becomes hard to sand down because it is so hard. Mine is called "Oatey" brand MEDIUM BLACK ABS CEMENT. <$5. It sticks perfectly to our ABS fairings.
Another time,
I busted off one of the screw mounts in the top of the fairing for the windshield bubble . (I was testing the larger shield from Givi at high speed.) I used abs cement to build back a new 'bump' about 1/2" tall by using a clay mold for a form, then filled it with ABS cement, and then drilled it and inserted the metal thread insert that Honda used originally.
I switched back to the Zero Gravity Sport touring shield with Heli bars. It is smaller than the Givi. But it has plenty of protection for 400 mile days.
