If these are just chips and knicks you may also want to look at a 2 part epoxy putty. Things like Magic Sculpt have good adhesion and are easily sanded once cured. I like Bondo and use both the glazing putty and the body filler but I often find that the body filler is overkill on a lot of things.
Keep in mind Bondo is traditionally an auto body filler. Its mostly used in quantity on large surfaces as that is what it was made for and when working with it in small amounts and in small areas it can be a pain to sand (Who am i kidding...its a pain to sand no matter what)
Sometimes you don't need a sledgehammer when a tack hammer will suffice!
