I received a quote to have my ceilings textured. Right now they are smooth and painted white. I had always heard you mix paint in with the mud when texturing so you don't have to paint after it is done. My drywall guy says he doesn't add paint and he doesn't even recommend painting after he is done. He said it creates a vapor barrier? He has many years experience so I feel I should be able to trust him but I was hoping for another experts opinion on this. I don't want my ceilings to have an unfinished look to them and would like to avoid having to go back and painting all the ceilings. What is everyone else's opinion about this?