So I'm trying to add a shower fixture to my "tub only" bathroom by just replacing the tub spout with another that will has a hand held shower unit diverter connection. Long story short, since this bathroom didn't ever have a shower (just a tub) the walls were'nt water proofed for such . Seems to me to be just regular drywall.
So is there a way I can water proof this now "shower equipped" bathroom without ripping out all the drywall and staring over with tiling etc? In other words can I somehow waterproof the current EXISTING drywall (that seems to be just painted) without tiling etc?