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Re: Irwin 34, port side hull repair ?
I don't know the Irwin but with any FRP hull, if you can now move the hull in and out by an inch, the FRP fibers themselves were broken and that compromises the structure of the hull. A proper repair would involve cutting out the affected area, feathering the edges of the cut to about a 12:1 angle, and laying in new laminate to form a structural repair. You'll find details in West System's web site, they go into details on everything and offer free telephone tech support for projects.
Yes, in theory you could just push it back out and then apply structural bracing behind it, inside the hull and hidden from view by that settee. Probably just as strong even if it is a kludge. But just applying foam and a brace? Might be "enough" but I don't think it would be a 100% structural repair.