Forgot to photograph before picture of crack and missing chunk of plastic on top of fairing. This was already fixed at this point. Light grey area is Plastex that was used to fill in and reform missing plastic chip. It also bonded crack from backside. I used masking tape applied over the missing section as a mold for the Plastex.
Glazing putty applied over gouges and indentations and then sanded flush with surface using 800 grit and sanding block
Getting the area repaired earlier with Plastex smooth with primer and glazing putty. The red coating is primer and it functions well as a leveling guide when sanding.
The first step was to rough sand the fairing with 400 grit. Next was to repair cracks and missing pieces with Plastex. Finally I filled in gouges depressions with glazing putty.
Next came the primer application. Applying the primer coat took the longest as I needed to make 4 attempts to get a perfectly smooth surface. Basically paint once, sand with 800 and block and take down rough spots, paint again, repeat until fairing is fully covered with primer and surface is perfectly smooth. High fill nature of primer means it will fill small scratches and tiny surface imperfections.
Once the primer was done I laid down two light color coats. Note this will not stick directly to the plastic fairing. It will only adhere to the primer. You can't really sand the color coat as it has the consistency of a vinyl coating when dried. Two soft for sanding. It also takes 72 hours to dry hard or at least as hard as it is going to get which is not hard at all.
Followed this up with 5 coats of clear coat and finally polishing the clear coat.