I'll be picking more tomatoes and canning them tomorrow. We are getting a nice soaking rain today. Thank you, Mother Nature!
I did one canner load (7 quarts) of tomatoes last Wednesday. I used Ball lids that I bought at the store over the winter, a box or two when they had them. Usually, they seal very shortly after I take them out of the water. These took a while. Two of them didn't seal at all, so we used one for that spaghetti sauce that night. As I was making the sauce, pop! the 6th one sealed, 2 HOURS after canning.
When I opened the one jar, I could see bits of tomato flesh under the rim of the lid, so I'm not surprised it didn't seal. Still, I have never had 2 jars of 7 not seal.
I'm going to use the Fillmore lids I got last year for the next batch, and see if there's a difference.