yup, use it mixed 50/50 with distilled water in your humidfier. Generaly as an activator, so to speak, and then just add distilled water as needed for about the next year or so.
I haven't had any negative experiences using this type of approach. I did have a slight mold problem in 1 humidore a while back that was only using distilled water. I went to the PG solution in it also and no mold problems since.
Barry