i don’t have a good sense of if i do this more or less frequently than others. try a mask once or twice and see how your skin responds. most died of exposure on an evening when the temperature had dropped to zero with a gale force wind blowing against them. something to be very thankful for. you can use a table saw or circular saw. i expect you to read about failure during the holiday season? i came back and i feel like into a more insane world than the one i left. 