The reason for priming before texture,(rarely done these days),is that it allows the texture to adhere and dry evenly. When applied to a no primer surface, the texture reacts different on the mud joints vs. ... When knocking down,the the texture over the mud joints will drag more than the papered surface.

Do you paint ceilings before texturing?

STEP 2: Prime before you texture the ceiling.

You might think that because textured paint is part drywall mud it will adhere to any surface, but for a quality job, you still want to prime first. This step will make application easier and give lasting results.

Do I need to prime after texturing?

Although it is recommended to prime the texture before you paint it, it is not always particularly needed. ... Keep in mind that while it's not necessary, the textured surface you are painting is already uneven, so priming would only help to ensure an even appearance to the coat of paint.