I'm assuming your are using a hot water bath. I've always pressure canned and when I pull the jars, the lids are always bulged up from the pressure in the jar. I not sure what you mean by a tiny crease. What brand jars and lids are you using. If I'm going to lose a seal on a jar it's usually in the first day or two. The cause is usually from some particle of food that got under the lid seal.
Sometimes I've had jars not seal. I call those dinner.
The only possible I can think of is that you are really tighting the rings down. They only need to be snug, not cranked on.
Last edited by Doug9345; July 25, 2013 at 07:48 PM.
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