Help with foam & fiberglass

[kens]

I am primarily a painter, but I am doing a project where I need to make a large (4-5feet high) 3D bright red voluptuous heart. It will be outside in the weather. I know little about this, but i think I want to use foam with fiberglass coating. But I have no knowledge of the chemistry here, don't know what kind of foam would work with what kind of fiberglass. Any help for me?
Thanks,
Ken

[F.C. White]

Blue board rigid construction insulation works great for creating large bulk forms on a limited budget. It takes well to fiberglass applications too.