How do others deal with this annoyance? your mudding job is near perfect, and you begin to paint the wall with a latex primer, which dissolves the mud and causes dingleberries on the surface.
The only way I can think of avoiding this is to use an oil-based primer, or maybe a shellac spray, but I don’t want to do that. I hate painting with oils.
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Are you wet sanding? I usually try to avoid it because it's too easy to use too much water which pre-softens the compound. If you're not, then make sure you've dusted the walls well, use a good quality drywall primer and don't apply it heavy. Done this way, I haven't had a problem.
One more thing, I don't thin topping compound. It does make it a little easier to apply, but I don't usually find it necessary and it could cause the problem you describe.
Use an ordinary drywall primer, a good roller and don't go back and forth so much.
Beat it to fit / Paint it to match
The drywall primers are great.
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Are you allowing enough time for the mud to dry completely? A bit of humidity can really slow down the drying .... if the room is not vented, it can take forever for the mud to dry.
Another cause might be using spray-thinned paint on a roller.
It only happens to me when I go over a thick patch of mud and leave it to draw moisture from the paint for a certain amount of time (like 5 to ten minutes) before going back over it.
A paint roller, like a brush, is designed not just to put paint on, but to pick it up too. It takes paint from where you don't need it and puts it where you do. When you roll paint on a wall you are distributing it from wet areas to dry areas. A patch of mud -even dry- will take the moisture from the paint into it's top layer and rehydrate for a short period. It's during this time when you shouldn't go back over the paint.
It seems like it takes at least a couple of minutes for the mud to get wet. After that, wait a while before recoating. If the mud is thick in one place it seems to retard the drying time by holding the moisture in.