Chutney jar seals

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.

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

You could try Miltons

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