high seal failure rate
I've been canning a batch of tomatoes ever weekend for the last 6 weeks, and I'm getting really annoyed with the number of cans that don't seal. The average is probably 1 out of 5 that don't seal. I always leave about 1/2 inch headspace, use a plastic spoon to get out air bubbles, use new lids, heat the lids in almost boiling hot water, and wipe the rims clean.
What am I doing wrong? :(