This unit does let you set the amount of time the bag is in the seal mode. Suggested time is 1.5 seconds. Hopefully that’s not long enough to melt the bag. Can always go lower if that is the case. Also there is no latch, you put pressure on the handle until the vacuum begins and the let go and let it do it’s job. Sounds like there will be a learning curve, with the UmaiDry bags, but am confident I’ll figure it out. I’ve used the unit on a few different items with regular bags and it has worked excellent. I’ll be sealing my first capicola Saturday. I will post how things go.