Twenty hours or so after I filled the base of my vacformed Dalek with casting resin I found a small area where the plastic had softened to something a bit like stiff chewing gum:
It more or less elastically recovers:
I don't know the resin chemistry but it is one of those clear embedding types, I got it from Hobby Craft and filled it with some powdered filler and black weathering powder. It only appears to have affected a small area about 1 by 2cm.
Has anyone seen anything like this? Will the plastic reharden or is there anything I can proactively do about it like putting it in a low oven, exposing to UV light, nuclear radiation, etc.?