I am replying to both this post, and the other thread you started about worry. There you related that there was a leak into the forward cabin from the compromised are in the fore deck.
Where is this leak? Is it from around the hatch, or holes where the bow pulpit is bolted thru, or from the bolts in the deck which held the "Anchor Nest"?
Balsa is characterized as a hard wood (despite its low density). The cells are short and closed, so that takes quite some time for wood (or resin for that matter) to permeate the cells. I recollect that one of our botanists had some addition to the specifics of this in a past post. This is important, because many epoxy compounds will not get into the cell--and rot can continue.
There area reasons that end grain balsa is used--and part of that is the partial permeation of polyester resin into the end grain of the balsa for a short distance. But this seal is tenuous, and easily broken---which in some cases causes delimitation of balsa from the fiberglass. From the sides of the cells, the penetration of epoxy is not as good.
As Sunbeam mentioned the use of "neat" or plain liquid epoxy, I would take that perhaps one further, by the use of one of the super thin epoxy, with low viscosity--such as "Git Rot" or CPES (Clear Penetrating Epoxy Sealer) to have been infused into the potentially damaged areas.
There are some interesting questions which are taken up on the "Rot Doctor" web site:
http://www.rotdoctor.com/L/BoatL/Bqa.html
One answer about Git Rot vs the epoxy that they advocate:
If you look at the Testing Section of our website, "Git-Rot" is product "B".
"Git Rot" will work to some extent if conditions are ideal, although in our opinion a standard epoxy resin with a slow hardener will work as well. That's basically all that "Git Rot" is. You will note in the Test Section that of the 6 ml of "Git Rot" applied to the balsa wood, less than 25% was absorbed.
The basic problem here is that "Git Rot" or a standard epoxy will not penetrate far enough to give one any confidence that all deteriorated areas have been saturated, and if they have not been saturated there is no assurance that the rot process has been deterred. We have seen many cases where a standard epoxy resin is applied to rotted wood, and although it gets hard and solves the problem in a particular spot, the rotting process can and will continue beyond the penetration area of the epoxy.
You will note that 6 ml of CPES penetrated 16", and when more was added it penetrated over 20". On wood that is reasonably dry, even if it is under fiberglass, CPES will penetrate thoroughly. Holes can be 5-7" apart. With sufficient cure time (about a week) CPES will harden the wood. If the wood is badly deteriorated, then two applications may be required. If there is actually missing wood on the interior, then we recommend that the CPES treatment be followed with an application of our Layup & Laminating Resin into the same holes. The L&L Resin is VERY slow setting and will penetrate a long way itself. You can see a demonstration of this process in our "What's New" section.
It is worth reading all of those posts in the above link which apply to boat decks, and core--especially balls.
Generally you want the core to be completely dry--and heating and vacuum is one of the ways to dry it out. If there is some rot still left, it may continued to migrate, even though you have fixed the leak.
Did epoxy drip out of where the leak was--if not, then I would be more concerned. If it did, then you probably got enough epoxy into the area.
My recommendation of further treatment (and worry), would depend on where the leak occurred. If the leak was where the bolt holes were for the Nest, and you feel that you got it all, then it will probably be OK--just watch. If it was else where--like the bolts of the bow pulpit or a cleat some distance from the anchor nest, or the hatch, then, I probably would use a moisture meter on the back side of the deck, and see if there is elevated moisture in specific areas. I would then consider injecting CPES thru holes with a syringe.
ops