I like the idea of separating the core into smaller pieces. I wish I would have thought of that. I did it in two pieces. I also cut the topskin off in two, more manageable pieces. I definitely recommend that, it made my life so much easier when I went to relaminate everything and replace the skin. Its also a good idea just to use epoxy all the way through. I didn't know enough about the difference between the two until I had already committed. I just went with what they recommended. Again, you can't very well disagree with someone who used to build boats for a living, at least I couldn't at the time. I did use almost 2 gallons of boatyard polyester by the time I was done though...its about $40 a gallon, so that would have gotten a bit pricy....But I agree, if you're going to go through all those headaches, you might as well do it right. Use epoxy, use poly, just stay away from that bonding putty....
As for the drill and fill option, I think it has its place in the very small and isolated areas. If it is less than 2 square feet, and hasn't spread farther than that, there isn't that much moisture there.....As long as you dry it out as much as you can, I don't see a problem with it. After doing a full recore, theres no way I would go through all that trouble for one or two isolated spots....Just my very humble opinion..... Anything bigger than the 1-2 feet, I wouldn't use it. There are plenty of people in my marina who have used that method with success. I live next to a guy who has been a naval engineer for 30+ years and has fixed his deck several years ago using Rot Stop. Its still solid as a rock.... Again, small isolated areas of course.
The area I used it on was only about 16" x 8"
1976 Catalina 27
St. Pete, FL