You can but it won't hold up to much use. I suggest you spring for the real stuff - go to your local video store and talk w/the owner who probably has the equipment needed.
I will go ever the steps I used when splicing audio tape; this will be 'roughly' equivalent.
1) on a cutting surface, trace both edges of the tape so that you will be able to line up the 2 edges for the splice (at least 6 inches).
2) trim both ends removing any stretched tape and making each end a good, flat 90 deg.
3) overlap the 2 tape ends usine the (1) marks to make sure they are alligned; the overlap should be long enough to a 45 deg cut to start at the upper corner of the top piece to the lower corner of the bottom piece.
4) flip the tape over so the non-mag side is up, line up the cut ends inside the (1) marks so that the 2 edges just meet - do not overlap. Have someone apply the tape; ideally the tape should be just as long as the diagonal cut; trim the excess tape from the sides.
X-acto knive (or its generic equivalent) is the recommended tool for trimming if you don't have a splicing tool that does all of this except, maybe, flipping the tape. you want the thinnest, toughest tape for splicing
Hope this helps,
GrimJack
February 2006