1 month post-op. Is it bad if sweat gets in my TT incision? When can I use stretch mark cream?

I WAS TOLD BY MY SURGEON I CAN START WORKING OUT AFTER 6 WEEKS BUT I FORGOT TO ASK HIM, IF IT WAS OKAY TO USE A SWEAT BINDER AKA WAIST TRAINER AND WHEN I TAKE IT OFF FROM WORKING OUT I AM FULL OF SWEAT DRIPPING WILL THAT HARM MY TUMMY TUCK INCISION? AND WHEN CAN I USE STRETCH MARK CREAM PLEASE HELP ???