The foam doesn't even really need to adhere like superglue- if it holds the romex firmly in place as it expands around it and doesn't deteriorate or damage the cables, I see no reason why it wouldn't be acceptable.
It does surprise me that it isn't listed for the purpose. Wouldn't it require an engineers stamp to be used, if the foam wasn't listed?
Edit: actually, now that I think about it, that would be an interesting business model for a consulting PE as a side job- to specialize in going back into f'ed up installations that failed inspection to bless or reject or overwise non-code compliant installations. Think there would be much demand for that?
[This message has been edited by SteveFehr (edited 11-15-2006).]
