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Thought I would share a bit of experience gained, that's why we go on these things yes?

Had a caliper with a rotted in bleed nipple which resisted all the usual spray & leave to soak, so read up on various freeze/release sprays and tried it out.
Stripped caliper down, cleaned it up a bit, put it in the oven @ 230 for 40 mins.
Whipped it out with gloves and bundle of rags, out to the vice, several sharp blows, long burst of freezer then clamped rounded off nipple in vice and rocked to&fro. Nothing, repeated, Nothing.
Then son arrived , grabbed can and started to spray as I rocked, Bingo, it went with less force than I had been previously applying.

Verdict (based on 1 experience only):
The freeze effect works but is instant, the moment you stop spraying the bolt comes up to temperature and the effect is lost.
So, it's spray and force application TOGETHER!

Thanks, I'll remember that.

I bought a can of the Halfords version of that a little while ago,
but haven't got round to using it yet.

My usual trick is to slide a nut over it and weld it on, the additional purchase you now have plus the heat usually does it. Careful though if you have alloy calipers.

Peter

It's only cooling whilst the solvent is on there the flash off. As soon as it dries it'll start warming again.