I bought a Seal-a-Meal for sous-vide cooking. It felt like a bargain at the time, it was very inexpensive because it was a close-out model. It seals great, I'm not having any problem with leaking, but it only pulls out the air maybe one out of five times. Other times it doesn't seem to suck any air at all. So the bag wants to float and there is too much air insulating the food from the water bath.
I don't want to spend any more money at this point, I want to make this machine work for me. Is there a trick I'm missing?