Yup...what he said...
Basically , save it for the wet areas. I also include the wall where a shower door may get installed, a wet area. Just as a precaution against any water damage later on.
Good luck...and by the way...there are no dumb questions...just answers sometimes!
Originally Posted by nealtw
Areas outside the shower, do not get as much water and don't need the redgard sealer, but all joints should be taped.