Thank you! The dings are all from the thing lying around for too long; the open-cell foam is cheap, but very fragile. I'll probably break down and get a new sphere and do it right away, so as to have a 'clean' one for contrast.
Squadron's 'Green Stuff' is actually styrene plastic in an acetone-based paste, which is why it's so smelly and death to any styrene foam. The blue and yellow epoxy ribbon that you knead into the green putty is actually very 'neutral' on things.
Happy to be of help!
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