Removing the foam and replacing with solid resin is not the best idea. This will then be a 1/4" thick sheet of epoxy in the hull wall? Heavy and will heat and possibly distort the hull wall when curing. If the epoxy is too stiff it may also crack.
If you have already removed the foam, you should probably cut the outer glass layer off and fill the inner area with glass mat or more of the foam sheeting that was originally in there and laminate it back together.
Best to leave the foam in and inject the resin to re-laminate the delaminated layer together. Typically the foam is fine and is just not bonded to one of the glass layers. I have personally done this to a 16 deck back in 1984 and that boat was just fine last I heard. The resin I used was somewhat flexible and not brittle. Something from a company called Boat Life. The stuff was called Git Rot. A two-part epoxy that is really easy to mix and inject from the plastic bottle it comes in.
Here is the tech image from the Hobie Cat Support pages. Pretty rough but explains it pretty well.
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