Wolfgang, I use "Bondo" like "Kleenex." I should have said "filler." Not sure yet which filler I will use. Probably one of the Evercoat Rage products or maybe the Upol flyweight filler, since it's going on over Upol Fibral. Most of the No-Bondo-Over-Glass concerns I've read have involve boat repairs.
Al: the repair seems strong. I glassed it from the top, 3 layers, and from the bottom about 4. I've got about 3/16-1/4 inch thickness on the repair, which is right about what the original glass is. No, I did not use a roller, just a little brush, and yes, I got a few air bubbles, which I sliced open on top and filled with the Fibral. Most of the glitches were around the steel spacers, so I want to make sure they're encased as tightly as possible.
I acetoned and sanded out the undersides of the fenders and it all looks good. Pretty sure it'll get another scrub and acetone and then a final skim with Fibral before I hit it with some sort of paint or undercoat or maybe Line-x bedliner to seal it up.
The tops of the fenders are ready for the filler, which will be followed by primer and paint. Gonna bondo the new spare tire carrier as well to mask my poopiehead welds before painting.
Like I said, I've got a few little 'glass chores to attend to before we get into the spray guns.