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verdict on CRC Freeze Off: GIMMIC
i think the reason it works for people is that it does contain penetrating lubricant. it does not, in fact, cool the part to -47deg. i followed their directions on a loose bolt; the coldest i could get it with a 20sec spray was around +39F according to my IR thermometer. that's not very cold.
on the other hand, using a can of office air duster, a 10sec spray from the UPSIDE DOWN can cooled the bolt to -18. i certainly could have cooled it further this way.
the CRC stuff has the oil mixed in; i think it interferes with the phase change of the refrigerant & makes it less effective. spraying the upside down can of air duster, though, spits out 100% liquid that converts to 100% gas on contact. it's this phase change that supplies the primary mode of heat transfer.
i tried this on the studs to no avail. dry ice would still work a lot better than either of these. liquid nitrogen? even better than that.....
looks like i'll need to break out the big guns this weekend.
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