I haven't done any, but I am also interested in experimenting. Metan has a few videos doing vacuum infusion. I think it probably doesn't make much sense if you are just re-coring a hatch or two. if you want to be fancy, you could just vacuum bag them. There are a ton of youtube videos on the subject.
As far a core goes . . . Most floors and hatches are cored with using scrimmed foam core like corecell or airex which is 5lb density PVC foam.
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