pod said: 
Y'all are taxing my brain here but if I can find the roll of tape I'll know for sure. The tape that worked best on the greenhouse plastic film for me was made by 3 M in a clear duct tape. If I still have any left I'll see if it has a number or type on the roll. I used it to seal the seams and it was even more durable than the film. Tough stuff!
To correct my error. It was a clear duct tape made by Scotch. I did find the roll after all these years... amazing.
