Pulled out a CMR Humpty Dumpty egg lofter that I started a few years ago (1983-ish). The reason it's been sitting in a shoe box since then is that while installing the top stage motor mount I applied the epoxy with a little too much enthusiasm and melted the styrene shroud (evidence below). I'd like to finish this to celebrate the 35th anniversary of starting the build: what can I use as a filler that will adhere to the styrene but not cause any more damage? Would Bondo work? Seems like Squadren Green/White would be too strong...
Suggestions?

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SAM #0031