Pd/Pt printing on Washi Paper

Im looking into starting to print on Gampi paper or Kozo paper and was wondering if papers such as these typically need to be sized, and if so, with what?

I've not sized Gampi tissue before, and the papers I've used print fine.

Having said that, I've also often wondered whether sizing would make the paper easier to handle or would reduce the amount of sensitiser it drinks.