I think Dirtwheelsfl and I might be arguing two different points. Based on what you said, I think you're planning on only "capping" the stringer. On the crude pdf I made (black is stringer, blue is foam, and red is new fiberglass), if you are doing "1", no amount of fiberglass will improve the crush resistance of the foam. If you are doing "2", you can use whatever you want with enough fiberglass (including charmin, cottonelle or wonderbread).
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