I'm always surfing the Internet looking at products, trying to see how many new natural lines there are out there. Well I fell upon this website and its pretty darn cool how they show you how to stretch a WNG. Ive never used this method before but its pretty neat. Basically after applying your styler, you section the hair, braid it a little and then put clips on the end. If you want to use a concentrated nozzle to stretch it further , it shows you that as well.
Take a gander, they also have a chunky twist out , and braid out tutorial