Stains are usually very similar to paints but have LESS binder so a weaker
film is produced. This is an advantage where wood is likely to have
significant moisture migrating form the back to the outside as in "natural"
wood siding.
 No problem should exist IF stains are used as a top coat also. But if you
seal the stain with a regular latex or worse an oil paint, it will trap
moisture behind the outer film and  will cause problems. Also with the
heavier pigment loading in stains and lower binder content you will have the
same effect if you paint over a chalky surface.
If it were me, I would buy the best latex primer and then topcoat with a
good latex, or if you prefer, then use the stain.
Dan Veilleux
In the mountains of NC

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