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I have just removed wallpaper and popcorn from plaster walls. I am ready to paint. I have purchased Behr paint and primer in one. Do I prime separately before painting with that? I can only assume the walls are from 1950 when the house was built.

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If I were you, I'd prime them first. Understand that paint + primer doesn't actually mean you're doing 2 coats of work. They do sell some (the top end expensive stuff) that says it works in one coat, but the dirty little secret of paint is you can generally use one coat as a primer for the next. My bet is you purchased the base grade, which has less of the primer in it than the mid and top tiers.

I would probably go with an oil-base primer here just to be safe. Wallpaper glue can sometimes cause bonding issues with your paint. All oil-base primers should help prevent that issue.

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    Personally, I've found that the 2in1 paint primer is only useful if the wall has a light, neutral color. Anything else will require a primer coat to mask the original color. – Stavr00 Nov 28 '17 at 14:37

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