Skip, I guess it depends on the application. I use mine soley for flashback on nymphs (works great by the way) so the curling isn't a problem. If using the material long as an accent or something in a streamer tail and you need it straight then try pulling a bit out from the spool and slowly pulling it through your fingers giving it a "little" stretch, this has worked for me in the past.
Good luck.
Kelly.
Tight Lines,
Kelly.
"There will be days when the fishing is better than one's most optimistic forecast, others when it is far worse. Either is a gain over just staying home."
Roderick Haig-Brown, "Fisherman's Spring"