I have tried this method and had excellent results, two complete wraps going the same direction of twist.
There never was any fouling after and the bore was nice and shiny after a range session, I never had any Teflon tape foul the bore.
I fired a 420 grain hard cast into a sand bank at about two feet, the Teflon was still attached to the slug.
I don't use his method all the time, but it does work and accuracy is very good as well.