Yea, then I have to work on my doublesided technique. Trying to decide if it is worth it. I would be their lifesave if I can do it though, guess they have looked everywhere and nobody wants it.
Tyvek should work fine for the application. Our sign business here is a sub-section of the printing company. I print 2-sided tyvek on a weekly basis and that is ran on a color copier. It only cost 10 pennies to print each side and kicks out around 50 12" x 18" sheets every minute. I would never suggest trying this with a wide-format inkjet printer. Ink cost to much and you will spend more than the 10 minutes it would take to print and cut down the whole job when using a color copier.