I came across this post at a wooden boat builder site regarding relatively safe and effective methods of arresting wood rot. Seems like it is worth a read and try.
Also I have a question regarding partially rotted floor repair in the bathroom of a 67 Overlander. I have cut out a bad section of flooring right at the rear of the bathroom about a foot square. I was going to clean out all of the rotted wood and put a wood subframe underneath to support the new section of wood which would be screwed to the existing wood floor. I noticed that instead of open space and trailer frame underneath there is a large relatively thick piece of OEM plastic that seems to actually be right beneath the original floor (and apparently above the waste tank). It is the same color as the bathroom plastic. If I feel around the space between the bottom surface of the bath floor and the top of this piece of plastic it seems to be holding a few puddles of water that probably leaked from somewhere and is keeping the bottom surface of the bathroom floor wet. What is this piece of plastic and why is it there?
I suppose a lot of my questions would be answered if I pulled the pan, but I don't want to do that right now. I just want to add a little floor integrity to the bath room.
Another of my wood building/repair guys told me to perhaps use a near water thin epoxy to give some temporary structural integrity to weak wood floors. Anybody try this...using a product called Get Rot or a similar product?