Q&A for How to Seal Glass Jars

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  • Question
    If I didn't get my lids sealed, can I just boil them again?
    Community Answer
    No, you can't. They can only be used once. You'll have to re-can them, sadly, for them to be safe.
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  • Question
    When sealing with a water bath, do I tighten the ring after removing the jars from the simmering water in step 8?
    Community Answer
    There is no need for this, because the seal material inside the lid during heating becomes soft and blocks every passage of air.
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    Not Helpful 2 Helpful 5
  • Question
    Can I seal my jars filled with raspberry jelly in the microwave?
    Community Answer
    No. The lids are not microwave safe, and the glass could overheat.
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    Not Helpful 2 Helpful 4
  • Question
    How can I seal the 2 piece mason jar lids together?
    Community Answer
    It is not necessary, and would defeat the purpose of a mason jar entirely. The idea of a mason jar is that you can seal jars without having to twist any caps, and use the second piece to secure the seal later. Twisting a cap in vacuumed chambers is much harder.
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  • Question
    What do I do if my jars did not seal? Can I change the lids and put them back in a pot to boil them?
    Community Answer
    No, you can't. They can only be used once. You'll have to re-can them, sadly, for them to be safe.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
    Yes No
    Not Helpful 3 Helpful 1
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