I'm attempting to fix my inlaw's carport ceiling. It has drywall coated with drywall mud that is flaking and falling off in spots. I've chipped off as much as I can and some areas are still stuck on there pretty good. I want to recoat the ceiling but have some questions. Do I need to use a primer on the whole ceiling first and then coat it with the mud? It was painted after the mud was coated last time so I have that do deal with also. I'll paint it again after it's done this time too. If my way is the wrong way, how should I go about fixing this?
I'm trying to remember exactly how I textured my basement walls and my stairway walls and ceiling. As I recall I mixed dry taping mud, I think it's called Quickset, [ it's the cement like product that's sold in 20 lb bags, has a 90, 60, 3o or 15 on bag indicating it's working or set up time- read the label) with inexpensive latex paint and I used a texturing roller. The goop set up and dried very quickly and it has been up for 8 yrs. now. It's possible the idea for this was found on the bag's label. The stuff is unsandable and for all practical purposes is cement. I used it in an inside application; I suspect one of the tradespeople will give you a better plan for your outside application though I wouldn't hesitate doing this again. Good luck. Cliff