Shaving with an Arko stick daily during a 3 week road trip is an Arko record for me. I didn't use any alum, aftershave, or moisturizer/balms and didn't experience any dryness issues. I will note:
1) getting the last traces of Arko off is hard. Alum helps clean my face of soap at home.
2) humidity ranged from extremely high to quite low. I was often dehydrated, but I was drinking over a gallon of fluids a day. I was working physically when not driving, and outdoors when not in the car. Pumping the water through my skin probably made a big contribution to keeping it healthy.
3) I'm covered in bug bites, but none on my face and the front of my neck. Was it the Arko?
LOL, there is more than one person who claims that Arko keeps mosquitoes and other critters away from you.