On my 21 one of the main stringers rotted out due to water intrusion. The glass on the stringer was still good. So I just added more glass and it is very stiff. Like Denny stated, wood or foam is only to give shape.
Check out page 3 of my rebuild...somewhere in #60 and you will see that I just glassed over the existing stringer. This is called the lost mold process.
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