If you're on good terms with your local film processor, might be able to save some cash - I had a couple of customers who I sold a roll of "Splicing Tape" to, never a problem as I always had enough stock to cover a sudden influx of film for processing.
Great stuff - and yeah, it's as strong as; trying to get it apart off a film leader could sometimes be a strength exercise for the fingers. . . . . . .