As johnny indicated you used a polyester resin and the styrene component melted the polystyrene foam. At this point you will have to pull up a lot of the lamination. A couple products will help with reattaching new foam and cleaning it up. First Gorilla glue make a white polyurethane glue, which is really good for glue down new foam or foam chunks. Secondly, get some lightweight spackle at your local hardware store. It is bright white, and very light weight. It does contain formaldehyde as a preservative, so use gloves, but it is used world wide to seal and fill holes in EPS blanks. Also, as tuneman indicated this is going to be a lot of work, but may be a fun project.
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