No, do not turn your jars upside down after removing them from the water bath. Jars should be left undisturbed for at least 1 hour so they can seal and start to cool down.
If you are concerned about fruit float, read this FAQ: My jam has separated. I have all the pulp at the top of the jar and juice underneath. What did I do wrong and how can I fix it?
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Posted in: 6. Questions About Jam-Making Equipment and Water Bath Canning