Some good advice in this thread. I also find when sealing anything that has moisture or liquid it helps to "hang" the bag off of a table. I place my unit on the edge of the washing machine so I can hang whatever I'm sealing vertically. Gravity does it's work and bags seal up fine.
UDS, Akorn, Weber Red Head Kettle, Drum Grill, Gasser w/cobwebs all over it. I'm JD.