Bondo putty has a much hotter "dope like" solvent package which would not be good for thin styrene.
Squadron, Testors, or Tamiya white putty should be fine, but I would test first as that capsule a s very thin.
Elmer's water based filler will stick, but I would "rough up" the surface to provide more "bite".

Yeah, I know pigs are flying (and it may be snowing in Hades) as I recommended a water based product.
I see the Elmer's product as having very few optimal applications, but this may be one.

Regardless of the filler/putty you choose, it's going to need at least four thin layers to fill that nasty scar. Don't try piling it on in one or two thick coats. It will not turn out nearly as well and will probably "chunk" off when you sand it due to not drying properly.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !