I am not a canning professional, do not take my words as truth!
I would think if they seal properly, then they are fine. Maybe if you heated it up with a water bath first, then tried to seal it. (Like everyone else said first)
However, I have tried to melt crayons over an open flame in one of those only to have it shatter.
I would think if they seal properly, then they are fine. Maybe if you heated it up with a water bath first, then tried to seal it. (Like everyone else said first)
However, I have tried to melt crayons over an open flame in one of those only to have it shatter.
