Using aerosol to cool your motors

Is turning a can of aerosol upside down and spraying your motors to cool them down legal?

There was this a couple years ago:

But I would like some kids to equip a dead motor with some sensors and actually test this to see if it makes even an iota of difference to cooling the motor. I somewhat doubt it.

We have done it before and have seen others do it, but only before or after a match. You cannot do it during your match. We used the canned air they use on computers. There were some forum posts on it as well and I believe Karthik ruled it ok. It does not do much on motors though. Some, but in the end was it enough? Who knows.