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Hi Steve
I do what you suggest and leave lap and mirror separate. Then press and rechannel before use. I usually give it a scuff with a brass brush and add micro facets with a Stanley knife too. I don’t want the mirror to stick to the pitch and ruin the lap.
I wouldn’t freeze it. That’s what I do when I want to remove the pitch. It can break off as it warms up at a different rate to the night plaster.
Some people store it in the fridge. I haven’t tried that.
Rod
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