Lew Hodgett ) writes:

The above applies ONLY to polyester, mat and roving.

It definitely does not apply to knitted glass and epoxy where the
glass/resin ration is about 50/50.

The above applies ONLY to vacuum bagging. 70% resin is optimistic for a home
builder filling weave by hand.


Also, epoxy/knitted glass laminates are much thinner and lighter weight
than polyester/mat/roving for equal strength.

This is NOT a structural application. It's canoe hull sheathing, abraision
resistance and fir ply check checking.

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