I have an exhaust fan in my master bathroom and also a wall heater. I like to run the heater without the fan running during my shower so that the room is nice and warm when towel drying off. I then run the fan for 15 minutes on a timer. This does a good job of removing the moisture and heat from the air, but condensation still remains on the drywall above the shower enclosure. Even with the fan running, so steam ends up forming condensation on those walls close to the shower.
Is it alright to have some condensation forming on these walls as long as it evaporates in a hour or so? Do I need to worry about moisture making it way through the paint and turning into condensation when it hits the vapor barrier behind the drywall? To date, I have never seen any spots of mold form on the painted drywall.