Glycol is claimed to be a succesful killer of rot spores, so preventing the rot from getting hold. It is also a reaswonable preservative. IIRC Mary Rose has been bathed in a specially formulated glycol based soltuion for the last 20 years to help stabilise her 400 year old timbers.

But they have been soaking her ever since she was raised 20+years ago, which highlights the point that it is virtually impossible to get any of the commercially available rot stabilisers far enough into the timber to actually do any good in na normal boat repair environment.