There are many ways to seal the edges of a vacuum bag. A survey:
SEALANT TAPE AT200Y YELLOW from Fiberlay works very well, but is one-time only. I could never get it off the bag so the bag was damaged getting the part out.
PVC pipe snap bead. I recall seeing this in the Gougeon’s magazine. A pvc pipe is ripped and then snapped over another, with the bag plastic in between. I resisted that way as the ripping is one more job to do.
Storm Window Bead. I prefer the inexpensive storm window sealer (Frost King by Thermwell Products http://beatlas.com)1-800-299-5700. They are inexpensive, but the shipping is expensive. Maybe I should keep a few hundred here in the office to go out with the plots.
Rope Caulk. I understand some have used rope caulk, but I could never get it to work well in the cold, which is most of the year here.
Stick. Matthew Reynolds uses a stick or pvc pipe on the bag end and rolls the bag around it. He then clamps the roll off. Along the long side he uses mailing tape with good results. The bag has to be even and smooth for that.
A guy could use a few tubes of Liquid Nails each bagging, but it takes some time to squirt out.
The joints or corners on all the systems take a shot of plywood panel adhesive (Liquid Nails) to seal.
Please add any others people have used with success.
I can see a published technical paper here with the results including vacuum hold duration comparisons and cost comparisons.