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Gord, I am becoming more enamored with water based paints. I'm thinking that for interior surfaces not in constant contact with water it is the way to go because of their advantages, i.e. less toxic fumes, easy to clean up dribbles and spills, and excellent durabillity and washability.
For sure, oil based primers are necessary to keep any chemical migration from the substrate outward (and, therefore, I must assume vice-versa) like from acids or bases contaminating a surface. Smells carried by and associated with acids and bases can migrate through water based paints and less so through oil based paints yet that may change as the newer water based paints become more sophistically formulated with the possible strong bonded long-chained molecules which theoretically might be able to contain acids and bases as well as oil based paint, but I don't know for sure.
For example, I had some new wood which got splashed with a rusty water having sulpheric acid and dried. Five coats of a good water based paint later the rust stain kept showing through after several days. One coat of oil based paint stops that.
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