I don't treat them. . . heck, I don't even iron the 'used' sheets. The strips I cut for the ant wings are so small, it's not a problem.

I have cut them with wing cutters for drake mayflies as well (those I iron ). Once the sheets have gone through the drier once or twice, they're a bit more translucent and "veiny" than they are when new out of the box. Make some great wings - very realistic looking!

Joe