Well, keeping in mind that I go back to the first Photopolymer from Murikami close to twenty years ago, when we still used Xylene, and even that had problems with dots rubbing off of saved screens.
I'm glad that your screens are not having the same problem.
Apparently they are now...
Tuff enough
[youtube]http://www.youtube.com/watch?v=aIhlOjmwHXU[/youtube]