The perforator I showed here is not very fun to use for larger amounts of film, and the result is not that good. I wouldn't consider using it for perforating long, existing rolls of non-perforated film... But, for your own coatings, it's completely different! When you have already done a huge amount of work when making the emulsion from scratch, and coating it, and it's your very own product and the quantity is low, then this kind of makeshift perforating is next to nothing to perform . Everything's so relative...