I have applied wax at around 3º above freezing. It can work, but the drying time is affected. (as are your fingers!) Haven't tried sealants at that temp.
If ya gotta, ya can, but I don't recommend it.
Also, as to the freezing of products - some will re-constitute after a vigorous shaking, others are finished. I prefer to err on the side of caution and keep all my stuff indoors.