I use PAM as a preventative a few times a year in tubs with cypress mulch or newspaper. I have not had any issues with using it on the cypress - I just mist as instructed (outdoors or in the garage), allow to air out for an hour or so (since teh cypress is damp), and add snake and water dish. The Pro-Products website states that it is safe to mist enclosures and substrate treated with PAM.
However, if you are treating an already-existing mite infestation, then you need to put your snake on paper towels to keep track of the little buggers as the previous posts pointed out.
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