I think it is important to realize that, whilst all of us mention repairing rotten wood, I believe it is safe to say that none of these products actually have much effect on wood that is rotted, but remains in place. I think it is best to consider them as suitable to fill irregular voids - but ONLY after all traces of rotten wood are removed down to good wood.
I was involved in litigation where an owner poured some such product on the top end of a rotterd out mooring post, on a boat ; a vertical post that runs from the deck down through the hull and is set into the keel. and then was surprised when, as he was being towed off of a sandbar, the post broke off below the deck level as the rot had eaten away the whole top half of the post.
I would advise taking claims that the products reclaim rotted wood very lightly.
Karl