Women dunk their face in ice water for flawless makeup hack

Warning: the video above does contain some coarse language 
How do you get your makeup to stay longer and have a better, matte coverage? Ice water, apparently.
But is covering your face in baby powder and then dunking your head in ice for 30 seconds really worth it? 
See how it's worked for these four women as they trial this Korean makeup hack called 'jamsu'.