The 1" Technical Laminations tape from Fellers. Let that stuff bond for 10 minutes and you'll tear the banner trying to separate the two panels.
PowerTape
no fold over...
i ordered a roll of this shortly after i read this...did my first couple banners with it tonight. VERY nice, looks nicer than a banner tape fold-over, imo.
thanks!
TUFF TAPE from Fellers.