Applying Borate Treatment to White Pine Logs in Cold Weather

Hi we were trying to get our log cabin sand blasted, borite treated and stained before winter. I have got it sand blasted and Sashco tells me that with the temperatures we are having 40-50 deg f during the day 30’s at night I should put the borite treatment powder in the checks and cracks and then caulk them. After this they say it is better to let everything sit bare through the winter and treat the logs in spring. My question is with the log being white pine will it be safe to let them go th