Sweaty armpits...What do against those? It doesn't smell and always use deodorant but I still sometimes get those "wet" spots...even if I just go somewhere.BTW I am in good shape.
Wear undershirt, carry a change of undershirt as needed.
let the deodorant dry before putting on your shirt.Sweating is normal, happens to everyone. You could try an anti-persperient, but they can be irritant and theoretically fuck with your body temperature regulation.