Impervious Ships (spoilers RWC)

[astagg]

Been cautiously reading this forum over the last few months and decided to join in now that I only have the epilogue from city of dragons to finish on my way home tonight and can't run into spoilers.

Thought I would start a discussion on what you think the new impervious ships are protected by? I am thinking that either someone else found a log like Leftrin did and perhaps grounded it to a paste that they have applied to the hulls.

Or due to the number of mentions of local wildlife being able to survive in the water something similar has been done with their skins...

Seems strange that after all this time of the rain wilders attempting to find other ways of making a usable boat (other than liveships) someone from Jamaillia does it in a couple of years after finding out about the river...