How often to spray with potassium bicarbonate

Growing at 45n and most of my plants ha 2 weeks left. A few have shown signs of pm and the odd spot of bud rot that I cut out and sprayed with peroxide. Next weeks forcast is calling for lots of rain, how often should I spray them with potassium bicarbonate? And how late into flower can I go ? Will it affect taste ? Thanks for the help

Bud Rot is systemic, its already inside your plant. Getting your plant wet by spraying wont do anything but encourage more budrot.

At two weeks left, you will only be hitting the outside of the flowers and adding uneeded moisture. My understanding is that you spray as the flowers form so that it is inside and creates a pH environment mold dislikes.