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No. It doesn't really matter.
I don't even use PVA. As long as the mud joints and texture is thoroughly dry.
If your painting flat wall, I just use several coats of the finish product. The first coat acts as a sealer.
Lightly drag a sanding pole between coats to knock down any high spots. Don't sand raw texture, it will remove it.
If your painting an enamel wall or ceiling, I would suggest using a primer. Enamels don't have a lot of sealing properties.
What are you painting?
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