I am a fan of WEST SYSTEMS. It is an excellent epoxy product. I use it exclusively in the wooden boats that I build. In fact if I was to ever replace the floor of my Airstream I would make sure that all the new ply flooring was sealed with it including all edges, top and bottom. It surprises that this is not standard practice with all the rotten floors that people are replacing. I am surprised that this is not done by the factory when they build Airstreams. Since they seem unable to build a trailer that does not leak at least customers would not have to worry about rotting floors.
Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."