Lifehacker: Apply Antiperspirant at Night for Maximum Effectiveness
If you use antiperspirant deodorant, applying it is most likely part of your morning routine (like its always been my routine). It's much more effective, however, to apply it at night before bed.
Applying your antiperspirant in the morning, particularly right after showering, makes it harder for the active ingredients to get down into your sweat ducts and clog them. In the morning your sweat volume is typically higher than it is at night, and your antiperspirant will wash right off.
The night is the best time for application because your sweat glands are less active and your skin is drier. The effect of the ingredients usually lasts around 24 hours and will remain active when you shower in the morning because the pores will still remain plugged.
Funny how we get an idea in our heads as to why something should work a particular way and we rarely question it - I always thought straight after a morning shower would maximise the following 12 hours of antiperspirant. I've tried this new routine for one day only but it seems to be working and did not wash off in the morning. I suppose it is much like the idea that eating fat will make you fat - it sounds logical, but it isn't.