I did this on my 27 Tournament hatches a couple of winters ago. I vacuum bagged them but the same basic rules would apply.
Once all of the old rotten coring has been removed, I followed these steps:
1) Lay down a fresh piece of 1.5oz mat on to the inside of the cleaned out hatch.
2) Cut core to size. I drilled small holes in mine so that the bedding putty I made out of thickened epoxy resin would have a place to flow as the bag pulled down.
3) Then I laid down one layer of 1708, breather cloth and peel ply.
4) Being a glutton for punishment, I then applied System 3 Quick Fair over the 1708, faired it and then applied EMC Quantum Epoxy Primer followed by EMC Quantum paint.
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