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You wrote about styrofoam and how toxic it is. I am not sure how putting paper and paste over styrofoam will release toxic fumes. I may not have interpreted the item correctly. Please elaborate on this.
I'm not sure where you read this, but styrofoam (or polystyrene as it is called in the UK) is perfectly fine to cover with papier mache. You may have been reading somewhere about people covering their work with paper"clay" and putting it in the oven. That *would* be dangerous as it would give off nasty fumes then!