Chutney jar seals

Thank you everyone. I used boiling water and it seems, so far, to have done the trick.

You could try Miltons

I never buy jars for preserving, just keep jars from sauces, jam etc, as long as lid is in good condition.

I'd suggest putting in bowl and pouring boiling water over, leaving for about 10 min before using to seal jars. That's what I do with my recycled lids when making jam. Silicone should last better than the orange rubber which perishes after a while.