My 2 cents, take out ALL old wood period. Replace with composite if money is not a problem, pressure treated otherwise. Make sure all old wood out, dry real good, replace right, peace of mind.
Also I just sold a boat with transom rot to a guy with a boat shop. He said to never ever use the pourable transom filler like seacast. He said too many people slip up one way or the other, and it doesn't attach itself to the existing fiberglass well and end up with bigger problems. Old fashioned way still the best.
Thanks okie no composite and common sense. GotchaWood is NOT the problem when it comes to boats...it's either Poor Craftsmanship on the part of the MFG or previous restorer, OR, Poor Maintenance and Care on behalf of the owner. If the wood components are properly encapsulated with resin and glass and then Proper Care and Maintenance procedures are performed then the wood will last for the life of the boat. I can see using composite materials for High Performance boats and or Ocean going boats that could encounter Heavy Seas but for the normal Inland Lake style boats Wood is MORE than satisfactory.
Just and Old Dumb Okies Opinion and worth every penney you invested!!!!:lol: